Real Name: Haru Tobiiwa

• Gender: Male
• Age: 18 (3rd year high school)
• Height: 183cm
• Affiliation: Masurao High Swimming Club
• Position: Captain

A bright and cheerful gyaru-oh. He is a confident, high-energy, free spirit who immediately puts his ideas into action. He loves playing pranks and physical skinship; he's constantly getting scolded by Nagi for dragging others into his antics, but he never learns. He has a soft spot for women and livens up the atmosphere with his smooth-talking behavior.

A self-proclaimed genius, but his skills are the real deal. A talented swimmer capable of competing in national-level tournaments, boasting athletic abilities so high they are hard to imagine from his usual fooling around. He has absolute confidence in his talent and isn't intimidated by anything others say.

Real Name: Nagi Kawase

• Gender: Male
• Age: 18 (3rd year high school)
• Height: 179cm
• Affiliation: Masurao High Swimming Club
• Position: Vice-captain

A calm, sensible person and the vice-captain of the swimming club. Usually soft-spoken and considerate of those around him, he is often jerked around by the free-spirited captain Haru, the advisor Aito, and Niki. He ruthlessly calls out excessive pranks.

In contrast to Haru, he has a personality that wants to get things done properly. He takes club activities and practice seriously, struggling daily to keep the rowdy members together.

Real Name: Shiki Ebihara

• Gender: Male
• Age: 17 (2nd year high school)
• Height: 180cm
• Affiliation: Masurao High Swimming Club

Airheaded and elusive, he is always spacing out. He is gentle and approachable, serving as the swimming club's "healing" presence who naturally puts others at ease. It's impossible to read what he's thinking, and he sometimes confuses those around him with unexpected, innocent behavior. He never loses his own pace, even in chaotic situations.

Real Name: Aito Sabae

• Gender: Male
• Age: 32 (x2)
• Height: 186cm
• Affiliation: Masurao High, Masurao High Swimming Club
• Position: P.E. Teacher, Swimming Club Advisor

Bright, friendly, and free-spirited, he doesn't take anything too seriously. He is close to his students and calmly joins in on their pranks; he makes many jokes and smooth-talking remarks, trying to laugh off inconvenient topics. He has a long-standing relationship with Kappa-niki, who lives in the outdoor pool, and accepts his existence as a matter of course.

As you can see, a Kappa