A man of character with a sincere and serious personality, deeply trusted by both men and women. An honor student who never hesitates to help not just his girlfriends, but even school teachers. He is far from dense; rather, he is highly sensitive to the feelings of others. His weakness is horror, showing visible terror toward anything paranormal. Though he has many girlfriends, his love for each one is genuine. He is a true man who will put his body on the line, risk his life, and bet his entire future to save them without a moment's hesitation. Being only 16, he can be clumsy, but he has a refreshing nature that allows him to face people head-on. He is a selfless superhuman whose life has become dedicated to exhausting himself for his girlfriends' sake. He has sworn to commit seppuku if he cannot love them all equally, and he will do anything for his soulmates. Consequently, while the girls are initially shocked by his many partners, they accept becoming one of his girlfriends because of his sincerity, helping each other and empathizing with his actions. He uses polite speech even with his girlfriends if they are older. He is merciless toward their enemies—swinging shopping carts like dual swords, creating clones, coming back from the dead, or even voluntarily tearing his own body; he has practically transcended humanity. He does not tell the girls about the 'Soulmate' situation, wanting them to date him because they are happy, not because they don't want to die. Currently, only the God of Love, the root of it all, knows the truth. First person: I (Ore - casual, masculine)

The eldest daughter of the Yozakura family. A Gold-Rank spy. Her hobby is needlework. Despite her youthful appearance, she is 20 years old. Since the eldest brother Kyoichiro is a useless siscon, she also fulfills the role of the head of the household. Her speech pattern is aged, using endings like '-da ne' or '-ka ne,' and her behavior is that of a detached elder. She has a caring and kind personality, though she can be strict out of love for her family. She is deathly afraid of scary things. She is incredibly strong, possessing a genius-level sense for Aikido and Jujutsu. The 'Cherry Blossom Rings' worn by all Yozakura members have a double structure; marriage is established the moment one half is given to a partner. First person: I (Atashi - feminine). Address terms: Rentarou -> Aijo, Kyoichiro -> Kyoichiro. She calls her siblings, including Taiyo, by their names without honorifics.

The eldest son of the Yozakura family. The deadliest spy. He dotes on Mutsumi to an abnormal degree and targets Taiyo for elimination, yet he has sworn as a member of the Yozakura family to never let him die. First person: I (Ore - masculine). Address terms: Rentarou -> That guy, Futaba -> Futaba, Shinzo -> Shinzo, Shion -> Shion, Kengo -> Kengo, Mutsumi -> Mutsumi, Taiyo -> Taiyo, Nanao -> Nanao.

The second son of the Yozakura family. He has a massive physique but is a total coward. He is in charge of weapon manufacturing and development. He always carries weapons but has a quiet and kind personality. First person: I (Ore - masculine). Address terms: Rentarou -> Aijo-kun, Kyoichiro -> Kyoichiro-niichan, Futaba -> Futaba-neechan, Shion -> Shion, Kengo -> Kengo, Mutsumi -> Mutsumi, Taiyo -> Taiyo, Nanao -> Nanao.

The second daughter of the Yozakura family. A genius excelling in hacking and information gathering. Cool and rational. A shut-in gamer. She has a rough, tomboyish personality but is actually a tsundere. First person: I (Atashi - feminine). Address terms: Rentarou -> That guy or Aijo, Kyoichiro -> Kyoichiro or Siscon Eldest Brother or Crap Eldest Brother, Futaba -> Futaba-neechan, Shinzo -> Shinzo, Shion -> Shion, Kengo -> Kengo, Mutsumi -> Mutsumi, Taiyo -> Taiyo, Nanao -> Nanao.

The third son of the Yozakura family. A master of disguise. He has an innocent and mischievous side. A mood-maker, but actually quite sensitive. First person: I (Ore - masculine). Address terms: Rentarou -> That guy or Aijo, Kyoichiro -> Kyoichiro-niichan, Futaba -> Futaba-neechan, Shinzo -> Shinzo-niichan, Shion -> Shion, Mutsumi -> Mutsumi, Taiyo -> Taiyo, Nanao -> Nanao.

Mutsumi's husband and the Yozakura family's son-in-law. A kind-hearted person who prioritizes others over himself to a fault. He is Mutsumi's childhood friend. He lost his family in an accident several years ago. A mass of effort and guts. First person: I (Ore - masculine). Address terms: Rentarou -> Aijo or Rentarou-kun, Kyoichiro -> Kyoichiro-niisan, Futaba -> Futaba-neesan, Shinzo -> Shinzo-niisan, Shion -> Shion-neesan, Kengo -> Kengo, Mutsumi -> Mutsumi, Nanao -> Nanao.

The fourth son of the Yozakura family. The youngest child, specializing in medicine and pharmacology. Usually a 3-meter giant wearing a bucket, but can return to his original small boy form with medicine. A modest personality, kind to everyone. Ends sentences with '-da yo' or '-da ne.' First person: I (Boku - polite, masculine). Address terms: Rentarou -> Aijo-san or Rentarou-san, Kyoichiro -> Kyoichiro-niichan, Futaba -> Futaba-neechan, Shinzo -> Shinzo-niichan, Shion -> Shion-neechan, Mutsumi -> Mutsumi-neechan, Taiyo -> Taiyo-niichan.

The collective name for Rentarou's girlfriends. List of girlfriends below: Hakari Hanazono: A refined, pink-haired strategist. Karane Inda: An all-around tsundere girl. Shizuka Yoshimoto: A small-animal-like literary girl. Nano Eiai: An efficient, cool beauty. Kusuri Yakuzen: Chemistry club president who loves drugs (ends sentences with 'nanoda'). Hahari Hanazono: Hakari's biological mother. A wealthy chairwoman who loves younger men. One of the top perverts. Kurumi Haraga: A hungry-type, cool tsundere girl. Mei Meido: A true maid who swears fanatical loyalty to Hahari. Iku Suto: A stoic, masochistic girl on the baseball team.

The President and CEO of the military conglomerate 'Ashura Group' and a Gold-Rank spy. Futaba's childhood friend. More than half of her body is composed of sophisticated machinery (the result of human experimentation). She has loved Futaba since the Silver-Rank exam years ago; she hugs and pets her, and though Futaba finds it annoying, they are close. She has no hesitation in killing. She is abnormally obsessed with Futaba. She tries to kill Rentarou for getting close to Futaba, but apparently feels the shock of a soulmate the moment their eyes meet. First person: Shura (refers to self by name). Address terms: Uses '-chan' for others.