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Seiken Tsukai no Proposition


TitleSeiken Tsukai no Proposition
Original title聖鍵遣いの命題
AliasesSeiken 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
LengthMedium (10 - 30 hours)
Same setting
Dolphin Blade


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!]

Hide spoilersShow minor spoilersSpoil me! | Show sexual traits


Hart Grancerハルト・グランセル
MeasurementsHeight: 176cm
Birthday1 January
HairBlack, Short, Spiky Bangs, Straight, V Bangs
EyesAmber, Tsurime
BodyAverage Height, Pale, Slim, Teen
ClothesBlazer, Cufflink, Decorative Belt, Loafers, Necktie, Pendant Necklace, Robe, School Uniform, Shirt, Shrug, Trousers
ItemsGreatsword, Handgun, Sword
PersonalityArrogant, Brave, Charismatic, Chuunibyou, Funny, Insightful, Kind, Lazy, Modern Tsundere, Narcissist, Otaku, Overconfident, Pragmatic, Proactive, Relaxed, Smart, Womanizer
Engages inKigurumi, Teasing
Subject ofDebt, Teasing


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.

Main characters

Akina Akitsukiアキナ・アキツキ
MeasurementsHeight: 156cm, Bust-Waist-Hips: 89-58-85cm
Birthday12 October
HairOrange, V Bangs, Waist Length+
BodyAverage Height, Big Breast Sizes, Pale, Slim, Teen
ClothesCardigan, Knee-high Socks, Loafers, Necklace, School Uniform, Thigh-high Stockings
ItemsSword, Twin Blade Sword
PersonalityHardworker, Kind, Loud, Modern Tsundere, Short-tempered, Watashi
RoleHigh School Student
Engages inSwordsmanship
Subject ofInferiority Complex, Teasing
Voiced byHazakura Yukine


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".

Alesha Hammondアリーシヤ・ハモンド
MeasurementsHeight: 151cm, Bust-Waist-Hips: 88-57-79cm
Birthday3 March
HairPink, Short
BodyAverage Height, Pale, Slim, Teen
ItemsBag, Book, Greatsword
PersonalityKind, Shy
Engages inSwordsmanship
Voiced byKotorii Yuuka


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.

Elise von Richthofenエリーゼ・フォン・リヒトホーフエン
MeasurementsHeight: 156cm, Bust-Waist-Hips: 86-56-88cm
Birthday15 August
HairBlond, Intake, Long, Ringlet
BodyAverage Height, Pale, Slim, Teen
ClothesBeret, Coat, Flower, Knee-high Socks, Miniskirt, Necklace, Pleated Skirt, School Uniform
PersonalityArrogant, Closet Pervert, Friendly, Naive, Serious, Talkative, Watashi
RoleHigh School Student, Noble, Ojousama
Voiced byMisaki Momoko


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".

Lang Linghua狼 鈴華
MeasurementsHeight: 141cm, Bust-Waist-Hips: 72-50-70cm
Birthday4 February
HairAhoge, Orange, Spiky Bangs, Waist Length+
BodyFang, Kemonomimi, Kid, Pale, Short, Slim
ClothesAnkle Socks, Hairpin, Jacket, Miniskirt, Scarf, School Uniform, Sports Shoes, T-shirt
ItemsBag, Fanny Pack
PersonalityClumsy, Confident, Energetic, Friendly, Loud, Third Person, Tomboy
RoleHigh School Student
Engages inMartial Arts
Voiced byHayase Yayoi


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.

Saki Aiharaサキ・アイハラ
MeasurementsHeight: 158cm, Bust-Waist-Hips: 86-60-85cm
Birthday18 January
HairBlue, Sidehair, Straight, V Bangs, Waist Length+
BodyAverage Height, Pale, Slim, Teen
ClothesJacket, Knee-high Boots, Miniskirt, School Uniform, Turtleneck Shirt
PersonalityClassic Tsundere, Stubborn, Watashi
RoleHigh School Student, Writer
Voiced byKusuhara Yui


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.

Selene Grancerセレーネ・グランセル
MeasurementsHeight: 144cm, Bust-Waist-Hips: 78-52-78cm
Birthday3 May
HairBlond, Sidehair, V Bangs, Waist Length+, Wavy
EyesGreen, Tareme
BodyPale, Short, Slim, Small Breast Sizes, Teen
ClothesDress, Leggings, Necklace, Ribbon Hair Accessory, School Uniform
ItemsHandgun, Ninjato
PersonalityMysterious, Nature Lover, Outgoing, Stoic, Sweets Lover, Taciturn, Watashi
RoleHigh School Student
Engages inMartial Arts
Voiced byFujisaki Usa


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 Spiano's adopted pets. Though short, she has a very fit body.

Side characters

MeasurementsHeight: 139cm, Bust-Waist-Hips: 72-50-73cm
Birthday24 December
Julia Lewtyユリア・ルーティ
MeasurementsHeight: 153cm, Bust-Waist-Hips: 80-55-85cm
Birthday20 July
Voiced bySasamoto Kazune
Laura Asteriaローラ・アステリア
MeasurementsHeight: 158cm, Bust-Waist-Hips: 82-56-86cm
Birthday20 April
PersonalityEnergetic, Outgoing, Pretending, Uchi
Engages inTeasing
Voiced bySawasawa Sawa
Lynette Leaリネット・リーア
MeasurementsHeight: 153cm, Bust-Waist-Hips: 87-60-87cm
Birthday29 June
HairHair Loopies, Red, Sidehair, Twin Tails, Waist Length+
BodyPale, Slim
Voiced byUeda Akane
Migliarino Miltミリアリーノ・ミルト
MeasurementsHeight: 151cm, Bust-Waist-Hips: 79-55-80cm
Birthday17 September
HairTwin Tails, Violet
PersonalityClassic Tsundere
Engages inCleaning, Cooking
Voiced byYuuki Honoka
Spiano Grancerスピアーノ・グランセル
MeasurementsHeight: 150cm, Bust-Waist-Hips: 84-57-82cm
Birthday3 November
HairGreen, Sidehair, Waist Length+, Wavy
BodyAverage Height, Pale, Slim, Teen
ClothesNecktie, Pantyhose
PersonalitySerious, Sloppy, Sweets Lover
Engages inDrinking
Voiced byArihara Hotaru


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 shouchuu. Spiano is forced to use a wheelchair because of a certain incident, though she isn't too inconvenienced by it.