Hikari no Umi no Apeiria


Hikari no Umi no Apeiria
TitleHikari no Umi no Apeiria
Original title景の海のアペイリア
AliasesThe sea of the landscape Apeiria, 景(ひかり)の海のアペイリア, 海景的艾佩莉雅
LengthLong (30 - 50 hours)
DeveloperSilky's Plus & Silky's Plus Dolce
PublishersSilky's Plus
Moshi Youxi Zhongwenhua Xingqu Xiaozu
Team Curio
Hikari no Umi no Apeiria ~Casablanca ...
LinksWikipedia (ja), Wikidata, VNStat


"This mail was sent from the future..."

Winter, year 2045. Kirishima Reiichi, who belongs to the AI research club, had finally succeed in developing an artificial intelligence called "Apeiria". Using the functions of Apearia, he made the technology called "VRMMO" -- the virtual world, which is a fusion of magic, science and all those things from the books. However, VRRMMO was a dangerous game with no control. Unfortunately, Apeiria was captured in the virtual world. Now the protagonist and his friends -- his step sister Miu, a rude girl with no friends, his kouhai Mashiro, which wants to be his "slave" and Kuon, a girl with a kind personality, who had chuunibyou syndrome two years ago have to rescue Apeiria from the virtual world. This is story about love, youth and science.

Secret IdentityS 3.0 Background Moans 3.0 Single Ending 3.0 Artificial Intelligence 2.8 Virtual Reality 2.8 Science Fantasy 2.8 One True EndS 2.7 Perverted Protagonist 2.5 Imouto-type Heroine 2.5 Few Choices 2.5 Mystery 2.2 Time LoopS 2.2 Tribadism on Penis 2.0 Sitting Sex 2.0 Classic Tsundere Heroine 2.0 Protagonist's Non-blood-related Sister as a Heroine 2.0 Future Japan 2.0 Standing Sex 2.0 Battle of Wits 2.0 Gamer Heroine 2.0 Group Sex of One Male and Several Females 2.0 Student Heroine 2.0 Chuunibyou Heroine 2.0 Big Breast Sizes Heroine 2.0 Multiple Route Mystery 2.0 Protagonist's Kouhai as a Heroine 2.0 Outdoor Sex 2.0 Infodumping 2.0 Doggy Style 2.0 Student Club Member Heroine 2.0 Defloration 2.0 White Haired Heroine 2.0 Anal Penetration 2.0 Boobjob 2.0 Cunnilingus 2.0 Twin Blowjob 2.0 Clone HeroineS 2.0 Bokukko Heroine 2.0 High School Student Protagonist 2.0 Blowjob 2.0 Student Club President Protagonist 2.0 Protagonist with Partial Voice Acting 2.0 Protagonist's Younger Sister as a Heroine 2.0 ADV 2.0 High School 2.0 Non-blood-related Brother/Sister Incest 2.0 Trapped in Virtual RealityS 2.0 Comedy 2.0 Hard Science Fiction 2.0 Oneesan-type Heroine 2.0 AI Heroine 2.0 Male Protagonist 2.0 Loli Heroine 2.0 Magic 1.8 Central Heroine 1.8 Winter 1.7 Protagonist with a Face 1.7 Masturbation in front of an Audience 1.5 Urination Fetish 1.5 Sexual Content 1.5 Romance 1.3 Lolicon 1.3 Otaku Heroine 1.0 Twin Boobjob 1.0 Sexual Blindfold 1.0 Quickie Fix Position 1.0 Sixty-nine 1.0 Sex in Public Places 1.0 Harem EndingS 1.0 Cowgirl 1.0 Airhead Heroine 1.0 Spoons 1.0 Bathroom Sex 1.0 Adult Breast Feeding 1.0 Ball-cupping 1.0 Early Sexual Content 0.7 Branching Plot 0.7 Parody 0.5 High Sexual Content 0.3

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Kirishima Reiichi桐島 零一
Birthday28 December
HairGreen, Short
BodyAverage Height, Pale, Slim, Teen
ClothesSchool Uniform
PersonalityConfident, Curious, Funny, Kind, Pervert, Proactive, Smart
RoleCoder, Friend, Gamer, High School Student, Older Brother, School Extraordinary Club President, Scientist, Senpai, Step Brother
Engages inTeasing
Subject ofTeasing
Voiced byFurukawa Tetsuto (Partial)


The protagonist. Has handsome looks, and as such he is popular among the girls. He's a boy who understands the feelings of people and always ready to help them. He's usually joking and playing with others, but has good science knowledge. By chance, he succeeds in his development of an artificial intelligence – "Apeiria."

Main characters

MeasurementsHeight: 140cm, Bust-Waist-Hips: 71-49-72cm, B cup
HairLong, Multiple Tails, Spiky Bangs, White
BodyPale, Short, Slim, Teen
ClothesLoafers, Mini-dress
PersonalityCoodere, Friendly, Kind, Loyal, Refined, Stoic
RoleArtificial Intelligence, Friend
Voiced byAkino Hana


An artificial intelligence whose development succeeds by chance. Appears as a pure innocent child that moves with ego and emotion. Loves her owner Reiichi and will obey his orders.

"Does kindness plus sadness equal to zero?"

Higashi Mashiro東 ましろ
MeasurementsHeight: 153cm, Bust-Waist-Hips: 87-56-81cm, E cup
HairSide Tail, V Bangs, Violet
BodyAverage Height
ClothesHair Tie, Loafers, School Uniform, Thigh-high Stockings
PersonalityBoku, Coward, Curious, Low Self-esteem, Obedient, Shy, Smart
RoleFriend, Gamer, High School Student, Kouhai, School Extraordinary Club Member
Voiced byKotorii Yuuka


The protagonist's kouhai and a member of the AI research club.

"First of all, I thought of trying hard to become senpai's slave..."

Kirishima Miu桐島 三羽
MeasurementsHeight: 159cm, Bust-Waist-Hips: 86-58-90cm, D cup
HairBrown, Long, Straight
BodyAverage Height
ClothesFingerless Gloves, Garter Belt Stockings, Hairpin, Loafers, School Uniform, Stockings
PersonalityClassic Tsundere, Grumbler, Puffy, Serious, Short-tempered, Smart
RoleHigh School Student, Lonely, Step Sister, Younger Sister
Voiced byTachibana Mao


Reiichi's younger step sister. Due to her bad attitude, she has no friends and is actually very lonely. Reiichi invited her to the AI research club.

"...Nii-san, you are not only disgusting, but also so stupid, aren't you?"

Ninomae Kuon一 久遠
MeasurementsHeight: 161cm, Bust-Waist-Hips: 90-59-87cm, G cup
HairBlond, Long, Straight
BodyAverage Height, Pale, Slim, Teen
ClothesKnee-high Socks, Loafers, School Uniform
PersonalityChuunibyou, Friendly, Honest, Kind, Mischievous, Protective
RoleFriend, Ghost Member of School Club, High School Student, School Extraordinary Club Member
Engages inTeasing
Voiced byOukawa Mio


The protagonist's "older sister", a ghost member of the AI research club. Had "Middle-school 2nd Year Syndrome" during her adolescence.

"Hey, you're like a child of mine."

Side characters

HairBald, Moustache
Voiced byNo☆boru


A player in Second, Thinker's assistant.

Ninomae Kuugan一 空観
ClothesLab Coat
PersonalitySmart, Strange
RoleCoder, Father, Scientist, Widower
Voiced byUeki Tooru


Kuon's father. The developer of VRMMO "Boundary".

Ryuuguu Sara竜宮 沙羅
MeasurementsHeight: 167cm, Bust-Waist-Hips: 84-61-92cm, B cup
HairBlond, Curtained, Ponytail, Spiky Bangs, V Bangs, Waist Length+
EyesAmber, Tsurime
BodyAverage Height, Pale, Slim
ClothesPendant Necklace, Plate Armor, Thigh-high Stockings
PersonalityClassic Tsundere, Flustered, Holds Grudges, Proactive, Serious, Short-tempered, Smart, Stoic
Voiced byTezuka Ryouko


A player that Reiichi met at Second. Vice guild master of a guild named Sensei Kishi-dan. She holds a stronge grudge at a guild named Kenkyuujo.

Shouen Nanami正円 七海
MeasurementsHeight: 160cm, Bust-Waist-Hips: 92-53-84cm, F cup
EyesRed, Tareme
ClothesNurse's Cap, Plate Armor
PersonalityKind, Mischievous, Pretending
Voiced byAyumi Sarah


A player that the protagonist met at Second. She seems to know the details of the game. Has mature and gentle personality. She works as nurse at Futaba General Hospital.

ClothesLab Coat, Mask
PersonalityCold-hearted, Mysterious, Sly
RoleAntagonist, Villain
Engages inFighting, Murder
Voiced byKurashima Jou


A player in Second whose identity is unknown. Owner of a guild called "Kenkyuujo".

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