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
LengthMedium (10 - 30 hours)
DeveloperSilky's Plus Dolce & Silky's Plus
Publishers Silky's Plus
 Moshi Youxi Zhongwenhua Xin...
Hikari no Umi no Apeiria ~Casablanca ...


"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.

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Kirishima Reiichi
Kirishima Reiichi桐島 零一 
Birthday28 December
Hair, Green, Short
Eyes, Green
Body, Average Height, Pale, Slim, Teen
Clothes, School Uniform
Personality, Confident, Curious, Funny, Kind, Pervert, Proactive, Smart
Role, Coder, Friend, Gamer, High School Student, Older Brother, School Extraordinary Club President, Scientist, Senpai, Step Brother
Engages in, Teasing
Subject of, Teasing
Engages in (Sexual)
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
Hair, Long, Multiple Tails, Spiky Bangs, White
Eyes, Amber
Body, B Cup, Pale, Short, Slim, Teen
Clothes, Loafers, Mini-dress
Personality, Coodere, Friendly, Kind, Loyal, Refined, Stoic
Role, Artificial 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
Higashi Mashiro東 ましろ 
MeasurementsHeight: 153cm, Bust-Waist-Hips: 87-56-81cm
Hair, Side Tail, V Bangs, Violet
Eyes, Amber
Body, Average Height, E+ Cup
Clothes, Hair Tie, Loafers, School Uniform, Thigh-high Stockings
Personality, Boku, Coward, Curious, Low Self-esteem, Obedient, Shy, Smart
Role, Friend, Gamer, High School Student, Kouhai, School Extraordinary Club Member
Subject of, Sexual Harassment
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
Kirishima Miu桐島 三羽 
MeasurementsHeight: 159cm, Bust-Waist-Hips: 86-58-90cm
Hair, Brown, Long, Straight
Eyes, Red
Body, Average Height, D Cup
Clothes, Hairpin, Loafers, School Uniform, Stockings
Items, Rifle
Personality, Classic Tsundere, Grumbler, Puffy, Serious, Short-tempered, Smart
Role, High 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
Ninomae Kuon一 久遠 
MeasurementsHeight: 161cm, Bust-Waist-Hips: 90-59-87cm
Hair, Blond, Long, Straight
Eyes, Violet
Body, Average Height, E+ Cup, Pale, Slim, Teen
Clothes, Knee-high Socks, Loafers, School Uniform
Personality, Chuunibyou, Friendly, Honest, Kind, Mischievous, Protective
Role, Friend, Ghost Member of School Club, High School Student, School Extraordinary Club Member
Engages in, Teasing
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

Hair, Bald, Moustache
Body, Adult
Voiced byNobo☆ru


A player in Second, Thinker's assistant.

Ninomae Kuugan
Ninomae Kuugan一 空観 
Hair, Beard
Body, Adult
Clothes, Lab Coat
Personality, Smart, Strange
Role, Coder, Father, Scientist, Widower
Voiced byUeki Tooru


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

Ryuuguu Sara
Ryuuguu Sara竜宮 沙羅 
MeasurementsHeight: 167cm, Bust-Waist-Hips: 84-61-92cm
Hair, Blond, Curtained, Ponytail, Spiky Bangs, V Bangs, Waist Length+
Eyes, Amber, Tsurime
Body, Average Height, B Cup, Pale, Slim
Clothes, Plate Armor, Thigh-high Stockings
Personality, Classic Tsundere, Flustered, Holds Grudges, Proactive, Serious, Short-tempered, Smart, Stoic
Role, Gamer
Engages in (Sexual)
Subject of (Sexual)
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
Shouen Nanami正円 七海 
MeasurementsHeight: 160cm, Bust-Waist-Hips: 92-53-84cm
Hair, Red
Eyes, Red, Tareme
Body, E+ Cup
Clothes, Plate Armor
Personality, Kind, Mischievous, Pretending
Role, Gamer
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.

Hair, Short
Clothes, Lab Coat, Mask
Personality, Cold-hearted, Mysterious, Sly
Role, Antagonist, Villain
Engages in, Fighting, Murder
Subject of
Voiced byKurashima Jou


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

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