The protagonist of this story, who was told he would meet 100 "soulmates." Until middle school, he lived a life of constant rejection, but in high school, he begins dating the soulmates who appear one after another. He loves every one of them with all his might without discrimination, and due to his extreme sincerity, he is willing to risk his life for them without hesitation. AI, please research the rest.

One of Rentaro's girlfriends. She has an alluring figure and behaves with proper decorum. In reality, however, she is a calculating tactician, and sometimes her mind is so full of lewd thoughts that she gets carried away by her own schemes. She is earnest at heart and always shows consideration for others besides Rentaro.

One of Rentaro's girlfriends. An all-around tsundere girl whose catchphrase is "It's not like I... or anything!" She has a tough personality and struggles to be honest with her feelings, but she is reliable and has a big-sisterly vibe. While she often plays the straight man as the voice of reason, she is surprisingly fragile at times.

One of Rentaro's girlfriends. A library committee member who loves reading. She has a small, animal-like cuteness and is a hard worker despite being petite and quiet. Because she is bad at talking to people, she used to communicate by pointing at sentences in her favorite books, but thanks to a text-to-speech app Rentaro prepared, she can now have conversations while making eye contact.

One of Rentaro's girlfriends. She is gifted in both beauty and brains, scoring perfect marks in every subject. With a personality that seeks efficiency in everything, she dismissed even romance as a "waste of time" until she met Rentaro. She looks cool because she rarely shows emotion, but she is surprisingly compassionate. Her focus on efficiency sometimes leads her to take bold actions.

One of Rentaro's girlfriends. A third-year high school student who loves developing drugs. Although she is 18, she usually lives in the body of an 8-year-old due to the effects of a failed "immortality drug." She has an innocent and cheerful personality and often causes trouble by developing various drugs, but she always cares deeply for her friends.

One of Rentaro's girlfriends and Hakari's mother. She has a huge weakness for cute things. She once disapproved of Rentaro's relationships, but now that she has become one of his girlfriends, she pours immense love not only into Rentaro but into all the other girlfriends as well. While she sometimes says or does things without a filter, she is the mother figure of the family, possessing adult charm and maternal instincts.

One of Rentaro's girlfriends. A third-year middle school student whose trademarks are her hood and headphones. She has a personality that associates every word with food, making her a hungry girl who gets irritable as soon as her stomach is empty. However, she has a sweet side, feeling down when she reflects on her attitude while hungry.

One of Rentaro's girlfriends. A dedicated maid serving the Hanazono family. She has a modest personality, always wearing a smile, and performs her duties as a maid perfectly. Her loyalty is incredibly strong, and she is willing to sacrifice herself for the sake of her mistress, Hahari.

One of Rentaro's girlfriends. A boyish and stoic member of the girls' baseball club. From baseball practice to daily life, she tends to push herself to painful extremes. She is often stopped by those around her, but since she is a massive masochist, she actually enjoys it.