Original titleせんすいぶ!
Aliases戦水部, Sensuibu!
LengthLong (30 - 50 hours)
Publishers Escu:de


In this country where it’s slightly warmer due to global warming, the hottest thing is a new female-only water sport called "sensui", where girls ride torpedo-like high-performance mini-subs called ‘MAV’s and try to knock down their opponents by shooting special water attacks at them. The sensui team at Aosaki Academy doesn’t have enough members nor do they perform well in competitions. However, the club leader Maasa is determined to turn around the fortunes of the school by enlisting a sensui ace Mito to the team. The four girls (Mito, Alice, Maasa, Rikoko) are managed by a male coach, Riku, whose dream of becoming a sensui player was dashed due to the gender restriction. Together, they aim to compete and win the national competition, the Wassergrahl.

[From Hau~ Omochikaeri!]


Hasemi Riku
Hasemi Riku長谷見 陸 A
AliasesUkifune Riku, うきふね りく
MeasurementsHeight: 176cm
Hair, Blue, Pubic Hair, Short, Spiky
Eyes, Blue, Tsurime
Body, Average Height, Muscular, Pale, Teen, Trap
Clothes, Jacket, School Uniform, Swim Shorts, Watch
Personality, Refined, Serious, Smart
Role, Classmate, Coach, Famous, High School Student, Schoolmate, Senpai
Engages in, Competition, Cross-dressing, Disguise, Sports, Swimming
Engages in (Sexual), Bondage Sex, Cunnilingus, Doggy Style, Missionary, Nipple Sucking, Piledriver, Quickie Fix, Seventh Posture, Sex in Water, Sitting Sex, Spoons, Standing Sex, Vaginal Fingering, Virgin Sex
Subject of (Sexual), Blowjob, Boobjob, Footjob, Handjob


The protagonist and the club's coach. He is the true identity of the well-known swimmer called "Ukifune Riku", but quit his career after having his dream broken.

Main characters

Arishe Fujinoha
Arishe Fujinohaアリーシェ・藤葉 A
AliasesAlice Fujinoha
MeasurementsHeight: 145cm, Weight: 40kg, Bust-Waist-Hips: 76-55-77cm
Hair, Blond, Sidehair, Spiky Bangs, Twin Tails, Waist Length+
Eyes, Blue, Tsurime
Body, Average Height, Pale, Short, Slim, Teen
Clothes, Bikini, Hat, Kemonomimi Headband, Ribbon Hair Tie, Ribbon Tie, Sailor Suit, School Swimsuit, School Uniform, Sports Swimsuit, Sweater, Thigh-high Stockings
Personality, Low Self-esteem, Short-tempered, Tsundere, Violent
Role, Classmate, German, Half-Japanese, High School Student, Kouhai, School Swimming Club Member, Transfer Student, Twin Sister
Engages in, Athletics, Competition, Reading, Swimming, Twin Switch
Subject of, Bullying, Inferiority Complex
Engages in (Sexual), Ahegao, Blowjob, Virgin Sex
Subject of (Sexual), Cunnilingus, Doggy Style, Missionary, Nipple Sucking, Sitting Sex, Vaginal Fingering
Voiced byUeda Akane


Aptitude Style: Sprinter
Hobbies: Reading (manga)
Likes: Udon
Dislikes: Her family

Mito's classmate whom everybody calls Alice instead of her real name, Arishe. Despite her doll-like appearance, Arishe is a tsundere, very aggressive and violent. On the flip side, Arishe suffers from inferiority complex, due to being bullied and treated badly when she was younger. Due to these experiences, Arishe lost her confidence in everything.

Housei Mito
Housei Mito蓬生 みと O
MeasurementsHeight: 151cm, Weight: 45kg, Bust-Waist-Hips: 80-57-80cm
Hair, Ahoge, Blond, Multicolored, Red, Short, Spiky, Spiky Bangs
Eyes, Red, Tareme
Body, Average Height, Pale, Slim, Teen
Clothes, Hairpin, Hoodie, Knee-high Socks, Ribbon Tie, Sailor Suit, School Uniform, Sports Swimsuit, T-shirt
Items, Pen
Personality, Altruistic, Clumsy, Deredere, Energetic, Friendly, Hardworker, Stubborn, Sweets Lover
Role, Bad Student, High School Student, Kouhai, School Swimming Club Member
Engages in, Athletics, Competition, Shopping, Swimming, Teasing
Subject of, Flirting, Teasing
Engages in (Sexual), Mirror Sex, Virgin Sex
Subject of (Sexual), Bondage Sex, Doggy Style, Missionary, Piledriver, Sitting Sex, Spoons, Standing Sex, Vaginal Fingering
Voiced byMoka Choko


Aptitude Style: All Mighty
Hobbies: Collecting Ukifune Riku goods
Likes: Ukifune Riku's swimsuit!
Dislikes: Scary people (Becomes weak in the presence of an angry person)

A freshman at Aosaki Academy, a kind-hearted and hardworking girl. She greatly admires Ukifune Riku, because of her, Mito started doing sensui (however, she doesn't realize that Ukifune Riku is actually her coach, Hasemi Riku). Bad at studying and due to not realizing that she's actually pretty good in sensui, is a fact that keeps her from growing as a sensui player.

Umegae Rikoko
Umegae Rikoko梅枝 莉子々 B
MeasurementsHeight: 160cm, Weight: 48kg, Bust-Waist-Hips: 89-60-85cm
Hair, Blue, Curtained, Parted in Middle, Ponytail, Spiky Bangs, Straight
Eyes, Blue
Body, Average Height, Pale, Slim, Teen
Clothes, Gloves, Jacket, Jeans, Ribbon Hair Tie, Ribbon Tie, Sailor Suit, School Uniform, Sports Swimsuit, Tank Top, Thigh-high Stockings, Turtleneck Sweater, Vest
Items, Pen
Personality, Kind, Mischievous
Role, Classmate, Full Sister, High School Student, Older Sister, Part-time Worker, School Swimming Club Member, Senpai
Engages in, Competition, Planning, Sports, Swimming
Engages in (Sexual), Blowjob, Boobjob, Footjob, Handjob, Sex in Water, Virgin Sex
Subject of (Sexual), Cowgirl, Doggy Style, Missionary, Vaginal Fingering
Voiced byMizukiri Keito


Aptitude Style: Tricker, Commander
Hobbies: Messing around with MAVs
Likes: Family
Dislikes: SUSUKI-brand MAVs (They're incompatible with her fashion sense)

A sophomore at Aosaki Gakuen and Riku's classmate.

Side characters

Hair, Beard, Grey, Short
Eyes, Kitsuneme
Body, Old, Pale
Clothes, Necktie
Role, Principal


The new principal of Aosaki Academy who joined the office just one year ago.

Eawase Satsuki
Eawase Satsuki絵合 皐 A
MeasurementsHeight: 163cm, Weight: 49kg, Bust-Waist-Hips: 85-62-86cm
Hair, Curly, Intake, Pink, Ponytail, Sidehair, V Bangs, Waist Length+
Eyes, Pink
Body, Average Height, Pale, Slim, Teen
Clothes, Bracelet, One Piece Swimsuit, School Uniform, String Ribbon Tie, Thigh-high Stockings
Personality, Arrogant, Smart
Role, High School Student, Kouhai, Rival, School Swimming Club Member
Engages in, Competition, Swimming
Subject of, Teasing
Voiced byAkashi Yuki


Aptitude Style: Queen
Hobbies: Shopping
Likes: BWW-brand MAVs
Dislikes: Ukifune Riku

West Japan's best Sensui player who is also Ukifune Riku's former teammate.

Hananoe Sakura
Hananoe Sakura花宴 桜 B
MeasurementsHeight: 167cm, Weight: 55kg, Bust-Waist-Hips: 91-64-89cm
Hair, Straight, V Bangs, Violet, Waist Length+
Eyes, Violet
Body, Average Height, E+ Cup, Pale, Slim, Teen
Clothes, Boots, Bracelet, One Piece Swimsuit, Thigh-high Stockings
Personality, Strict, Tomboy
Role, Childhood Friend, Coach
Engages in, Competition, Swimming
Engages in (Sexual), Not Sexually Involved
Voiced bySugihara Matsuri


Aptitude Style: Attacker
Hobbies: Training
Likes: Powerplay in sports (like pushing her opponents off their balance)
Dislikes: Psychological tricks

Hasemi Yui
Hasemi Yui長谷見 優衣 
Hair, Brown, Curly, Waist Length+
Eyes, Brown
Body, Pale, Slim, Young-adult
Clothes, Belt, High Heels, Pantyhose, Pendant Necklace, Skirt Suit
Personality, Pretending, Sloppy, Smart
Role, Cousin, Teacher
Engages in (Sexual), Not Sexually Involved
Voiced byHaruna Ren


Riku's cousin and a mathematics teacher at Aosaki Academy who lives with him. In the public eye, she is a teacher with both beautiful personality and appearance. However, when she steps home, she turns to the laziest person ever, not even bothering to do any household chores. Despite this, she is pretty smart and often encourages Riku.

Miotsukushi Tarou
Miotsukushi Tarou澪標 太郎 
Hair, Ahoge, Blond, Brown, Short, Spiky
Eyes, Amber
Body, Muscular, Olive, Teen
Clothes, Swimming Spats
Personality, Nature Lover
Role, Classmate, Friend, High School Student, School Swimming Club Member
Engages in, Swimming
Voiced byKurusugawa Isamu


A second-year student at Aosaki Academy who is Riku's classmate and best friend. A member of the academy's swimming club, Tarou is such a good swimmer he has entered a couple national-level competitions.

Sekiya Hotaruko
Sekiya Hotaruko関屋 蛍子 B
MeasurementsHeight: 147cm, Weight: 42kg, Bust-Waist-Hips: 76-??-??cm
Hair, Ahoge, Shoulder-length, Spiky Bangs, Teal, Twin Tails
Eyes, Blue, Tareme
Body, Average Height, Slim, Tanned, Teen
Clothes, Ankle Socks, Bracelet, Hair Tie, One Piece Swimsuit, Ribbon Tie, Sailor Suit, School Uniform, Spats, Sports Shoes, Sports Swimsuit
Personality, Boku, Energetic, Stubborn, Tomboy
Role, High School Student
Engages in, Competition, Swimming
Engages in (Sexual), Not Sexually Involved
Voiced byAkino Hana


Aptitude Style: All Mighty, Diver, Surfer
Hobbies: Swimming
Likes: Playing sensui with everybody
Dislikes: Lazy people