---
title: "Seiken Tsukai no Proposition"
description: "This is the debut work for UnicoЯn.   There exists a legend about a king who obtained a relic from a lost civilization and used its power to grant any wish to u"
image: "https://t.vndb.org/cv/78/140278.jpg"
---

# Seiken Tsukai no Proposition

![Seiken Tsukai no Proposition](https://t.vndb.org/cv/78/140278.jpg)

**Alternative Title:** 聖鍵遣いの命題

**Aliases:** Seiken Tsukai no Meidai, 聖鍵遣いのプロポジション, Proposition to the Holy Key Contractant, Sekapoji, 圣键遣的命题

**Developer:** UnicoЯn / Project L.A

**Release date:** May 27, 2016

**Platform:** Windows, Website

**Language:** Japanese

**Rating:** 7.2/10 (76 votes)

## Description
This is the debut work for UnicoЯn. 

There exists a legend about a king who obtained a relic from a lost civilization and used its power to grant any wish to unite the world. This relic, ‘Sora no Ison’ (Legacy of the Sky), was sealed afterwards by the ‘holy keys’ somewhere in the world. Countless persons have attempted to find it, but none of them could even find a trace of its location.

Haruto is a hopeless guy who was forced by the headmaster Spiano to attend the Academy, but ended up skipping all classes. When she made him work part-time, an unfortunate incident caused him to carry a huge debt to her. To pay off the debt, he was unwillingly tasked to explore to the depths of a sealed ruins as part of a supplementary test. His fellow test-taker Akina mentioned that it was rumoured that the elusive relic was sealed deep in the ruins. Vowing to become rich and to show Spiano up, he faced the challenge with heightened vigor.

[From [Hau~ Omochikaeri!](https://omochikaeri.wordpress.com/2016/05/01/may-2016-eroge-releases/)]

## Characters
### Hart Grancer (ハルト・グランセル)
Regardless of who his opponent is, Hart always insists on looking down on them. Despite acting like a big shot, hei is completely reliant on his guardian, Spiano. In other words, he is a useless person. He often tries to become independent but isn't able to hold a job for long because of his high pride. Thanks to that, his debt keeps raising and raising. He has the ability to discern lies.

- **Gender:** Male
- **Measurements:** Height: 176cm
- **Birthday:** 1 January
- **Hair:** Black, Short, Straight, V Bangs, Spiky Bangs
- **Body:** Teen, Slim, Pale
- **Clothes:** School Uniform, Trousers, Robe, Necktie, Shirt, Pendant Necklace, Shrug, Decorative Belt, Cufflink, Loafers, Blazer
- **Items:** Sword, Handgun, Greatsword
- **Personality:** Proactive, Modern Tsundere, Otaku, Lazy, Narcissist, Relaxed, Arrogant, Kind, Funny, Smart, Womanizer, Overconfident, Chuunibyou, Brave, Insightful, Pragmatic, Charismatic
- **Engages in:** Swordsmanship, Martial Arts, Teasing, Kigurumi
- **Eyes:** Amber, Tsurime
- **Role:** Boyfriend, Friend, Rival
- **Subject of:** Teasing, Debt

### Akina Akitsuki (アキナ・アキツキ)
A bright and cheerful girl that loves cute things. Akina a hardworker but because everyone around her is gifted, she carries feelings of inferiority. Quite normal and average in everything outside of her boob size. When agitated, she swings her fists around while yelling "idiooooot".

- **Gender:** Female
- **Measurements:** Height: 156cm, Bust-Waist-Hips: 89-58-85cm
- **Birthday:** 12 October
- **Hair:** Waist Length+, V Bangs, Orange
- **Body:** Teen, Slim, Pale, Big Breast Sizes
- **Clothes:** School Uniform, Necklace, Cardigan, Knee-high Socks, Thigh-high Stockings, Loafers
- **Items:** Sword, Twin Blade Sword
- **Personality:** Hard Worker, Modern Tsundere, Short-tempered, Kind, Watashi, Loud
- **Engages in:** Swordsmanship
- **Eyes:** Violet
- **Role:** High School Student
- **Subject of:** Inferiority Complex, Teasing
- **Voiced by:** Hazakura Yukine

### Alesha Hammond (アリーシヤ・ハモンド)
The kind of silent girl that would read a book in a corner.

Isn't good with crowds or talking to people. 

Though it's hidden by her uniform, has a surprisingly nice body.

- **Gender:** Female
- **Measurements:** Height: 151cm, Bust-Waist-Hips: 88-57-79cm
- **Birthday:** 3 March
- **Hair:** Pink, Short
- **Body:** Teen, Slim, Pale
- **Engages in:** Swordsmanship
- **Eyes:** Amber
- **Personality:** Shy, Kind
- **Role:** Princess, Secret Identity
- **Items:** Bag, Book, Greatsword
- **Voiced by:** Kotorii Yuuka

### Elise von Richthofen (エリーゼ・フォン・リヒトホーフエン)
The third daughter of a noble who is quite prideful. Despite her haughty attitude she is easily pushed around. Elise gets easily carried away when she gets flattered. Likes flashy and sparkly things. Even when not asked about them, Elise loves to go on about her "family's glorious teachings".

- **Gender:** Female
- **Measurements:** Height: 156cm, Bust-Waist-Hips: 86-56-88cm
- **Birthday:** 15 August
- **Hair:** Blond, Long, Intake, Ringlet
- **Body:** Teen, Slim, Pale
- **Clothes:** School Uniform, Coat, Necklace, Miniskirt, Knee-high Socks, Beret, Flower, Pleated Skirt
- **Eyes:** Blue
- **Items:** Handgun
- **Personality:** Friendly, Arrogant, Naive, Serious, Talkative, Watashi, Closet Pervert
- **Role:** Noble, High School Student, Ojousama
- **Voiced by:** Misaki Momoko

### Lang Linghua (狼 鈴華)
A very nimble and active girl who is always overflowing with energy. Despite her young looks and childish personality, Linghua loves to act like an older sister in the presence of the others. She is also weak to headpats.

- **Gender:** Female
- **Alias:** Rin
- **Measurements:** Height: 141cm, Bust-Waist-Hips: 72-50-70cm
- **Birthday:** 4 February
- **Hair:** Ahoge, Waist Length+, Spiky Bangs, Orange
- **Body:** Slim, Pale, Kid, Kemonomimi, Fang, Small Breasts
- **Clothes:** School Uniform, Jacket, Scarf, T-shirt, Miniskirt, Sports Shoes, Hairpin, Ankle Socks
- **Eyes:** Blue
- **Personality:** Friendly, Clumsy, Tomboy, Energetic, Confident, Third Person, Loud
- **Engages in:** Martial Arts
- **Role:** High School Student
- **Items:** Bag, Fanny Pack
- **Voiced by:** Hayase Yayoi

### Saki Aihara (サキ・アイハラ)
A very serious girl. She has a fine figure which is admired by the girls around her. Unknown to everyone, Saki writes light novels (mostly romance) during her free time.

- **Gender:** Female
- **Measurements:** Height: 158cm, Bust-Waist-Hips: 86-60-85cm
- **Birthday:** 18 January
- **Hair:** Blue, Waist Length+, Straight, V Bangs, Sidehair
- **Body:** Teen, Slim, Pale
- **Clothes:** School Uniform, Jacket, Miniskirt, Turtleneck Shirt, Knee-high Boots
- **Eyes:** Black
- **Items:** Handgun
- **Personality:** Classic Tsundere, Stubborn, Watashi
- **Role:** Writer, High School Student
- **Voiced by:** Kusuhara Yui

### Selene Grancer (セレーネ・グランセル)
While Selene always sports a blank expression and is hard to read on the outside, at her core she is a very passionate person, but at the same time a bit spoiled. She has a small body that animals like and because of this, Selene is in charge of feeding [url=/c42835]Spiano's[/url] adopted pets. Though short, she has a very fit body.

- **Gender:** Female
- **Measurements:** Height: 144cm, Bust-Waist-Hips: 78-52-78cm
- **Birthday:** 3 May
- **Hair:** Blond, Waist Length+, Wavy, V Bangs, Sidehair
- **Body:** Teen, Slim, Pale, Small Breasts
- **Clothes:** School Uniform, Dress, Necklace, Pantyhose, Ribbon Hair Accessory
- **Eyes:** Green, Tareme
- **Items:** Handgun, Ninjato
- **Personality:** Stoic, Outgoing, Nature Lover, Sweets Lover, Mysterious, Taciturn, Watashi
- **Engages in:** Martial Arts
- **Role:** Homunculus, High School Student
- **Voiced by:** Fujisaki Usa

### Diogenes (ディオゲネス)
- **Gender:** Female
- **Measurements:** Height: 139cm, Bust-Waist-Hips: 72-50-73cm
- **Birthday:** 24 December
- **Traits:** 

### Julia Lewty (ユリア・ルーティ)
- **Gender:** Female
- **Measurements:** Height: 153cm, Bust-Waist-Hips: 80-55-85cm
- **Birthday:** 20 July
- **Role:** Princess, Secret Identity
- **Personality:** Haraguro
- **Voiced by:** Sasamoto Kazune

### Laura Asteria (ローラ・アステリア)
- **Gender:** Female
- **Measurements:** Height: 158cm, Bust-Waist-Hips: 82-56-86cm
- **Birthday:** 20 April
- **Role:** Orphan, Antagonist
- **Personality:** Pretending, Outgoing, Energetic, Uchi
- **Engages in:** Planning, Teasing, Disguise
- **Voiced by:** Sawasawa Sawa

### Lynette Lea (リネット・リーア)
- **Gender:** Female
- **Measurements:** Height: 153cm, Bust-Waist-Hips: 87-60-87cm
- **Birthday:** 29 June
- **Hair:** Red, Twin Tails, Waist Length+, Sidehair, Hair Loopies
- **Body:** Slim, Pale
- **Eyes:** Green
- **Voiced by:** Ueda Akane

### Migliarino Milt (ミリアリーノ・ミルト)
- **Gender:** Female
- **Measurements:** Height: 151cm, Bust-Waist-Hips: 79-55-80cm
- **Birthday:** 17 September
- **Hair:** Violet, Twin Tails
- **Engages in:** Cooking, Cleaning
- **Eyes:** Violet
- **Personality:** Classic Tsundere
- **Role:** Waitstaff
- **Voiced by:** Yuuki Honoka

### Spiano Grancer (スピアーノ・グランセル)
Despite her young age, Spiano is the principal of the academy and an elite of the administrative bureau. Though she may seem like a very serious person considering her status, Spiano is actually very sloppy and lazy when alone or at home, though she is quite competent when at work. Has eyes for nothing but sweets and [url=https://en.wikipedia.org/wiki/Sh%C5%8Dch%C5%AB]shouchuu[/url]. Spiano is forced to use a wheelchair because of a certain incident, though she isn't too inconvenienced by it.

- **Gender:** Female
- **Measurements:** Height: 150cm, Bust-Waist-Hips: 84-57-82cm
- **Birthday:** 3 November
- **Hair:** Waist Length+, Wavy, Green, Sidehair
- **Body:** Teen, Slim, Pale
- **Clothes:** Necktie, Pantyhose
- **Engages in:** Drinking
- **Role:** Captain
- **Items:** Wheelchair
- **Eyes:** Pink
- **Personality:** Serious, Sweets Lover, Sloppy
- **Voiced by:** Arihara Hotaru

## Shops
- [Official Website](http://unicorn.la/product/01sekapoji/index.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=880913)

## Releases
### Japanese
- **2016-03-17**: Seiken Tsukai no Proposition - Trial Edition - [Official website](http://unicorn.la/product/01sekapoji/download/index.html)
- **2016-05-27**: Seiken Tsukai no Proposition - Package Edition - [Official website](http://unicorn.la/product/01sekapoji/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=22863), [Getchu](http://www.getchu.com/soft.phtml?id=880913)
- **2016-05-27**: Seiken Tsukai no Proposition - Download Edition - [Official website](http://unicorn.la/product/01sekapoji/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=22863)
- **2019-07-23**: Seiken Tsukai no Proposition - Best Price Edition - [Official website](http://unicorn.la/product/01sekapoji/index.html), [DMM](https://dlsoft.dmm.co.jp/detail/hobe_0323/)
- **2020-04-24**: Seiken Tsukai no Proposition - [Official website](https://web.archive.org/web/20250313023348/https://oo.parts/title/z7A5178jwJOuWR4ilt8n)

## Tags
Superpowers, Action, ADV, Combat with Firearms, NVL, High School, Fighting Heroine, Sword Combat, Romance, Comedy, Protagonist's Senpai as a Heroine, Male Protagonist, Fighting Protagonist, Drama, School Life Comedy, Life and Death Drama, One True End, Late Branching Plot, Ojousama Heroine, Modern Tsundere Heroine, Classic Tsundere Heroine, Low Sexual Content, Homunculus Heroine, Heroine with Superpowered Side, Late Sexual Content, Tomboy Heroine, Big Breast Sizes Heroine, Love Overcomes All, Only Avoidable Sexual Content, Proactive Protagonist, Defloration, More Than Seven Heroines, Boobjob, Group of Friends, Third-person Narrative, Blowjob, Heroine with Intake Hairstyle, Protagonist with Superpowered Side, Central Heroine, Arrogant Protagonist, Chuunibyou Protagonist, Long Common Route, Unlockable Sexual Content, Sexual Blindfold, Perverted Heroine, High School Student Heroine

## More Games from UnicoЯn / Project L.A
- [Seiken Tsukai no Proposition](https://pinovel.net/v18681)

---
*View the full details at [pinovel.net/v18681](https://pinovel.net/v18681).*

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