ココロ@ファンクション !

Original titleココロ@ファンクション !
AliasesKokoro@Function!, C@F
LengthLong (30 - 50 hours)
Kitami Rikka Fan Club
Cocoro@Function! NEO
LinksWikipedia (ja), Wikidata, VNStat
Shops» JP¥ 7124 @ DLsite (jpn)


Halfway through the 21st century, we are surely approaching something called the “network golden age”. The Multi-purpose communication card “Orca” provides a phone network (that goes without saying), an overwhelming number of apps to use allowing one to shop from their home telephone, and even a way to receive school lessons.

Even IDs and the health insurance cards are all incorporated into the Orca card. It wouldn’t be an exaggeration to say that one’s entire life is influenced by this one small card.

I, Hayami Taiyou, lives in a city that supports cutting-edge Orca cards, also a student of Makoto Advanced Academy (something like this city has the best ones).

Blessed with friends, and although i have no large problems occur in my daily life…… A bug occurred in some students’ Orca card after a sudden automatic update was applied. An unusual app called “Cocoro Function” was installed. And it seems I was one of them, and apparently due to this app, my inner thoughts are revealed to the people around me.

“Chairman! Bad News!”
“What’s wrong? (But, I would never get tired of groping your bouncing boobs)”
“Chairman! You pervert!”

You can’t delete the app, but on the other hand you couldn’t live without Orca either. After that, it was impossible to hide my erotic delusions. Furthermore, apparently there are other apps at school that have special features that are also causing problems. The troubles in school are gradually building up.

I had to do something, and with that in mind, I gathered a group of people also bothered by this mysterious app, and started up the Cocoro Function Countermeasure Committee (CFC), in order to try to solve the problem.

Can everyone else and I retain our peaceful school life!?!

[Translated from Official Site]

Protagonist's Full Sister as a Heroine 3.0 Protagonist's Younger Sister as a Heroine 3.0 High School 2.8 Fictional Island Near Future Japan 2.7 Virtual Reality 2.7 Heroine Twin Sisters 2.6 Super Deformed CG's 2.5 Student Heroine 2.5 Comedy 2.4 Multiple Endings 2.4 ADV 2.3 Long Sexual Scenes 2.3 Protagonist with a Face 2.3 Student Protagonist 2.2 Branching Plot 2.2 Romance 2.2 Transfer Student Heroine 2.2 Voice Replay 2.2 School Dormitory 2.2 Late Sexual Content 2.2 Male Protagonist 2.2 Hacker Heroine 2.0 Genius Heroine 2.0 Internet 2.0 Heroine with Zettai Ryouiki 2.0 Protagonist's Kouhai as a Heroine 2.0 Super Deformed Sprites 2.0 Perverted Protagonist 2.0 Proactive Protagonist 2.0 Defloration 2.0 Highly Animated Sprites 2.0 Only Virgin Heroines 2.0 Bleep Censor 2.0 Hikikomori Heroine 2.0 Heroine with Big Breasts 2.0 Other Perspectives 1.8 Sexual Content 1.8 Blood-related Brother/Sister Incest 1.8 Heroine with Multiple PersonalitiesS 1.8 Naked Sprites 1.8 Title Parody 1.7 Outdoor Sex 1.5 Built-in Encyclopedia 1.4 Shimaidon with TwinsS 1.3 Imouto-type Heroine 1.3 Sitting Sex 1.2 Doggy Style 1.2 Missionary Position 1.2 ShimaidonS 1.2 Sex in Public Places 1.2 Group Sex of One Male and Several FemalesS 1.2 Twin BlowjobS 1.0 Spoons 1.0 Mutual Masturbation 1.0 Clothed Male Naked Female 1.0 Student Council President Protagonist 1.0 Single Boobjob 1.0 Single Handjob 1.0 Single Blowjob 1.0 Vaginal Masturbation 1.0 Anal Sex 1.0 Unlockable Harem EndingS 1.0 Cowgirl 1.0 Group of Friends 1.0 Pretending Heroine 1.0

Hide spoilersShow minor spoilers | Show sexual traits


Hayami Taiyou速水 太陽
MeasurementsHeight: 170cm
HairBlue, Parted to Side, Short
BodyAverage Height, Pale, Slim, Teen
ClothesBelt, Boots, Necktie, School Uniform
ItemsMobile Phone
PersonalityCloset Pervert, Friendly, Hardworker, Optimist, Ore, Pervert, Proactive, Relaxed
RoleBoyfriend, Classmate, Friend, Full Brother, Gamer, High School Student, Older Brother, Popular, Student Council President
Engages inComputering, Teasing
Subject ofDelusion, Flirting, Teasing


Hayami Taiyou is a diligent and respected leader in Makoto Advanced Academy. His calm and collected demeanor grants him plenty respect as an authority figure, however his perverted and whimsical thoughts herald in a plethora of unfortunate consequences for this protagonist.

Main characters

Hayami Asagao速水 朝顔
MeasurementsHeight: 156cm, Bust-Waist-Hips: 91-59-86cm
HairBlack, Parted to Side, Sidehair, Straight, Waist Length+
BodyAverage Height, Big Breast Sizes, Pale, Slim, Teen
ClothesBoots, Naked Shirt, Ribbon Tie, School Uniform
PersonalityAntisocial, Brocon, Closet Pervert, Deredere, Genius, Hardworker, Jealous, Reserved, Watashi
RoleCoder, Full Sister, Hacker, High School Student, Hikikomori, Younger Sister
Engages inComputering, Cosplay, Teasing
Voiced byHatori Ichi


Out of all of the characters in the story, Hayami Asagao is probably the most hardworking and intelligent. She finds solace in her work, which typically consists of programming. Having proven herself from the creation of a successful app for the Orca card, Asagao is the backbone of the Cocoro Function Countermeasure Committee. Her true potential is clouded by her depressive nature, which is slowly addressed and dynamically aided throughout the story.

Shirakusa Ibuki白草 いぶき
MeasurementsHeight: 152cm, Bust-Waist-Hips: 79-57-83cm
HairBrown, Intake, Odango, Shoulder-length, Sidehair, Twin Tails, V Bangs
BodyAverage Height, Pale, Slim, Teen
ClothesBoots, Clothing with Ribbons, Headband, Miniskirt, Necktie, Pajamas, Pleated Skirt, Ribbon Tie, School Uniform, Shirt, Skirt, Thigh-high Stockings
ItemsMobile Phone
PersonalityBookworm, Kind, Low Self-esteem, Shy, Third Person
RoleHigh School Student, Kouhai, Schoolmate, Twin Sister
Engages inReading
Subject ofTeasing
Voiced byFujisaki Usa


Ibuki is the more submissive and introverted out of the Shirakusa twins. She sometimes has trouble properly communicating her thoughts clearly, despite being a thoughtful and studious girl. Her favorite pastimes are reading and self-contemplation.

Shirakusa Mebae白草 めばえ
MeasurementsHeight: 152cm, Bust-Waist-Hips: 79-57-83cm, B cup
HairCurtained, Odango, Shoulder-length, Twin Tails, Violet, Wavy
EyesAmber, Tareme
BodyAverage Height, Pale, Slim, Teen
ClothesBoots, Clothing with Ribbons, Headband, Miniskirt, Necktie, Pajamas, Pleated Skirt, Ribbon Tie, School Uniform, Shirt, Skirt, Thigh-high Stockings
PersonalityAssertive, Atashi, Energetic, Friendly, Lazy, Mischievous, Sleepyhead
RoleFriend, High School Student, Kouhai, Schoolmate, Twin Sister
Engages inFlirting, Teasing
Subject ofBridal Carry, Piggyback Ride
Voiced byMomoya Minami


Mebae is a more dominant, extroverted girl. Her friendly and charming personality is countered by her shrewd antics to create an interesting amalgam. She’s far more lazy than her younger sister, Ibuki, and often sleeps 10 or more hours just to pass the time.

Yuzuriha Hijiri譲葉 聖
MeasurementsHeight: 160cm, Bust-Waist-Hips: 88-58-85cm
HairBrown, Parted to Side, Shoulder-length, Sidehair, Wavy
EyesBlue, Tsurime
BodyAverage Height, Big Breast Sizes, Pale, Slim, Teen
ClothesBoots, Hairpin, Jacket, Knee-high Socks, Pajamas, Ribbon Tie, School Uniform, Shirt, Skirt
PersonalityArrogant, Clumsy, Friendly, Refined, Smart, Watashi
RoleClassmate, Friend, High School Student, Popular
Voiced byYuuki Serika


Yuzuriha Hijiri embodies the stereotypical high school princess. She is a dignified, bright, and elegant young lady with a strong and well-defined fashion sense. She takes pride in her image, and carefully prepares herself, be it through morning ablutions, studying, or anything else in life. Despite her intellect, she is quite inept in the use of technology, constantly trying to circumvent her lack of understanding by requesting a simpler means of communication. When embarrassed by her own clumsiness, she will become quite flustered, resulting in agitated ramblings.

Side characters

Endou Chie遠藤 智慧
MeasurementsHeight: 159cm, Bust-Waist-Hips: 90-57-85cm
HairBlue, Long, Spiky Bangs, Straight, Tiny Braid
BodyAverage Height, Big Breast Sizes, Pale, Slim, Teen
ClothesBoots, Clothing with Ribbons, Hair Tie, Lace-up Shoes, Leggings, Mini-dress, Pleated Skirt, Ribbon Tie, School Uniform, Thigh-high Stockings, Trousers
PersonalityHardworker, Jealous, Serious, Strict
RoleHigh School Student, Student Council Member
Voiced byHoshizaki Iria


The vice president of the student council who is very hardworking and serious. She has a complex about her large breasts.

Harusaki Kasumi春咲 かすみ
MeasurementsHeight: 155cm, Bust-Waist-Hips: 83-58-85cm
HairBrown, Short, Spiky Bangs
BodyAverage Height, Pale, Slim, Teen
ClothesAnkle Boots, Clothing with Ribbons, Knee-high Socks, Pajamas, Ribbon Tie, School Uniform, Shirt, Skirt
RoleHigh School Student, Kouhai, Student Council Treasurer
Voiced byShirotsuki Kaname


A junior student in charge of accounting. She gets along well with Taiyou. It's different from love but she deeply respects him.

Makes an appearance