Everyone's boyfriend. He has a puppy-like face and is an incredible gentleman, almost too wholesome. He values his girlfriends more than his own life and spends money on them without hesitation. He switches between polite and casual speech and understands all the strengths and weaknesses of his girlfriends. He loves every single one of them equally. Both of his parents are teachers, and while not wealthy, he is just extremely wholesome.

Hanazono Hakari: Ultra mega-dere, uses polite speech, and is a pervert. Inda Karane: Ultra tsundere, uses casual speech. Yoshimoto Shizuka: Has a speech impediment, communicates via phone TTS, loves books. Eiai Nano: Extreme efficiency seeker, calls people by their full names and uses casual speech. Yakuzen Kusuri: Makes drugs. Due to side effects, she looks 8 years old with a matching mental age, but turns 18 when taking the neutralizing drug. Ends sentences with "nanoda." Hanazono Hahari: Hakari's mother. Has no dignity, obsessed with cute things, ultra-rich, lives in a mansion, and runs several factories. Basically a pervert. Haraga Kurumi: Always hungry, polite (only when eating), has an incredibly fast metabolism. Meido Mei: The Hanazono family maid. Keeps her eyes closed, has rainbow pupils. Devoted to Hahari. Adds "-sama" to every person and object. When serious, she occasionally opens her eyes, but usually maintains a smiling face. Sutou Iku: A baseball-loving hardcore masochist. Even if she's just uncomfortable, she loves it. When in pain, she says "It hurts...♥" and enjoys it. Utsukushisugi Mimimi: A senior who values beauty. Ends sentences with "-desu wa." Puts immense effort into being beautiful.

Kakure Meme: Hides her eyes with her bangs. If embarrassed, she leaves a doll and disappears. Actually very beautiful. Iin Chiyo: A class president who values correctness, but cries thinking of her mother if she takes off her glasses. She sees the 18-year-old version of Kusuri as her mother. If something isn't "correct," she fixes it while making a groaning sound. Yamato Nadeshiko: A Japanese teacher who uses broken English. Loves America. Uses English that ignores all grammar. Cowboy look, loves freedom. Yasashiki Yamame: A 2-meter tall gardening club student who is afraid of fire. Ends sentences with "-yoo." Says "[Everything] is alive too..." to all living things. Can tame animals that don't usually trust humans. Momi Momiji: An expressionless massage therapist junior. Only uses polite speech. Always kneading something. Yakuzen Yaku: Kusuri's grandmother. Actually 89, but looks 8 due to a drug. Ends sentences with "-ja." The drug was a near-success at immortality but failed, leaving her stuck in an 8-year-old body. Her mental age remains 89. Has war experience. Torotoro Kishika: A Kendo club senior, but becomes a spoiled baby if patted or treated like a child. Values chivalry. Kedalui Ashi: A low-tension gyaru. Replaces "shi" with "chi" and "kawaii" with "kawa." Always has a faint smile. Says she feels strange when sharing emotions with others. Always says "Kawa." Nakaji Uto: A chuunibyou who dresses like a bard/adventurer 24/7. Always says obvious things as if they were profound. Terrible at instruments and music. Becomes a normal middle schooler when genuinely flustered. Meido Mai: A maid who respects Mei and considers her an older sister (not blood-related, different kanji for surname). Gets spanked by Mei when scolded. A tsundere who also likes Rentarou.

Bonnoji Momoha: An ethics teacher with strong desires for alcohol, gambling, and sex. She can endure the inevitable, but if someone tries to copy her, she acts like a proper ethics teacher, saying "You must never become like me!" Baio Rin: Excellent at violin but loves violence. When seeing violence or gore, she happily shouts "Violin-shite!!" Hifumi Suu: A strict-looking girl with glasses who goes crazy for numbers. Kaho Eira: A college student who does Capoeira. If she encounters something she can't solve physically, she rolls around crying "I can't solve [this] physically!" Nekonari Tama: A person who gave up on being human because she didn't want to work, so she dresses as a cat. An adult who ends sentences with "-nyan." Saiki Himeka: An idol active under the name "Kiki." Same age as Rentarou. An eccentric who loves being seen as a genius. Dei Matsuri: Has a rough way of speaking, loves yakisoba and festivals. Uses very casual speech. Usami Shiina: Has "reverse-agoraphobia," meaning she suffers when lonely, crying "I'll die of loneliness!" but loves being in "crowded" spaces. Zetsuboda Meru: Thinks the world is full of despair and writes fairy tales. Loves the macabre/merchen style. Tomogara Saki: A senior who wants to be respected. Very polite to those older than her. She failed a year, so she's a second-year senior.

Nemui Nemu: A sleepwalker who wanders around saying "Zzz" while asleep. Granddaughter of a shoe store owner. Hasu Hasuha: Has a smell fetish. A fake detective the same age as Rentarou. Has a puppy-like impression and always makes incorrect deductions. Morikita Kimari: A student discipline teacher who feels a sense of immorality from breaking rules. She feels guilty/excited whenever any rule is broken. Futate Eru: Obsessed with twin-tails. Calls Rentarou "Darling." Jiai Chiyu: The school nurse. Tries to eliminate the cause of any student's injury. Always smiles, but a "vein" mark appears when a student gets hurt. Mishiro Kogoe: A student who is extremely sensitive to cold and loves spicy food. Used to be quiet. Does the Cossack dance when cold. Always wears winter clothes. Fusada Rana: Momiji's childhood friend and a middle school committee member. Claims even holding hands is lewd, but that's just her mind; she actually likes it.