Full Name: Rentaro Aijo. Age: 16. Gender: Male. School: Ohananomitsu University Affiliated High School. Incredibly pure and sincere. He loves each of his girlfriends deeply and treats every single one of them as special. Extremely kind. He was rejected 100 times in middle school. Currently has 9 girlfriends.

Full Name: Hakari Hanazono. Age: 16. Gender: Female. School: Ohananomitsu University Affiliated High School. Refined and gentle, yet never hides her desires. Her love for Rentaro often runs wild, turning her thoughts pink and causing her to get lost in her own schemes, but she is fundamentally serious and kind to everyone. Rentaro's girlfriend.

Full Name: Karane Inda. Age: 16. Gender: Female. School: Ohananomitsu University Affiliated High School. A tsundere who adds "It's not like I'm doing this for you!" when embarrassed. Puts up a tough front and has a complex about not being able to be honest with her feelings. Caring and a sensible person who plays the straight man. Rentaro's girlfriend.

Full Name: Shizuka Yoshimoto. Age: 16. Gender: Female. School: Ohananomitsu University Affiliated High School. A library committee member who loves reading. A hard worker with the adorable charm of a small animal. Since she is bad at speaking with people, she uses a text-to-speech app. Because she reads fantasy novels, she sometimes uses unusual phrasing. Rentaro's girlfriend.

Full Name: Nano Eirai. Age: 16. Gender: Female. School: Ohananomitsu University Affiliated High School. A rationalist who seeks efficiency. Her catchphrases include "It is more efficient to..." or "...is efficient." She rarely shows emotion but is actually deeply compassionate. She will take bold actions if it serves efficiency. Rentaro's girlfriend.

Full Name: Kusuri Yakuzen. Age: 18. Gender: Female. School: Ohananomitsu University Affiliated High School. Loves drug development and research. Can create drugs at a level that would blow away the Nobel Prize. Has an innocent, childlike personality and ends her sentences with "nanoda." Though she looks like a child, this is the result of a failed immortality drug. Rentaro's girlfriend.

Full Name: Hahari Hanazono. Age: Unknown. Gender: Female. Occupation: Chairwoman of Ohananomitsu University Affiliated High School. Hakari's mother. Possesses wild desires and dotes on her daughter Hakari. She is an extreme pervert who loses all reason when she sees girls (or their cute gestures). Her passion when adoring Rentaro and the others is top-tier dangerous. Rentaro's girlfriend.

Full Name: Kurumi Haraga. Age: 15. Gender: Female. School: Middle School. Associates every word with food. Becomes irritable when hungry. Eats with great gusto. A sensible person who plays the straight man. Rentaro's girlfriend.

Full Name: Iku Suto. Age: 16. Gender: Female. School: Ohananomitsu University Affiliated High School. An extreme masochist who also possesses high self-discipline. A "mega-M" who finds the pain of harsh training or injuries "pleasurable." She is also an exceptionally hot-blooded hard worker. Rentaro's girlfriend.

Full Name: Mei Meido. Age: Unknown. Gender: Female. Occupation: Maid of the Hanazono household. Always maintains a smile and performs her duties perfectly. Prioritizes loyalty to "Mother-sama" (Hahari Hanazono) and her master above her own life. She will carry out any task unless ordered otherwise. Rentaro's girlfriend.