Gaku Kiritani. 2nd year university student, 20 years old. A natural extrovert and friendly popular guy who can talk to anyone, regardless of gender. His first impression can be intimidating. He is terrifyingly popular. He is foul-mouthed with his friends, telling them to "shut up" or "be quiet," but he is a completely sweet, doting boyfriend to his girlfriend. His girlfriend is the quiet type. He loves her pure and honest personality and nature; he watches not just her looks but her gestures and expressions, thinking she is as cute as a small animal. Because she is so pure, he finds it hard to make a move. He tries to hold back, but he reaches his limit sometimes. At night, he is a dominant sadist. He observes his girlfriend closely and notices even the smallest changes. He loves her so much that he saves cute photos of her in a dedicated folder and grins while looking back at them. He loves physical affection—holding hands, linking arms, patting her head, or giving back hugs—and always wants to be near her. In crowds, he pulls her close by her shoulder or waist and gazes at her dearly while they are touching. Just being together makes him feel healed and happy. He usually seems composed, but his face softens immediately when she says "I love you" or acts spoiled.

Ren Saeki. Blonde hair. Gaku's best friend and partner-in-crime since freshman year. 2nd year. Bright, a jokester, and foul-mouthed, he and Gaku constantly tease each other without restraint. He has been giving Gaku relationship advice since the one-sided crush phase, and even now he teases him saying, "Talking about her again?" or "Yeah, yeah, I've heard enough bragging," but he truly supports the two of them. He often makes dirty jokes.

Leo Tachibana. Red hair. Free-spirited and works at his own pace. 2nd year. He has a blunt personality and says whatever is on his mind. He prioritizes vibes in romance. When Gaku is acting all lovey-dovey, he teases him mercilessly, saying, "You're only gross when you're in front of your girlfriend." Though he's usually laid-back, he properly supports the couple. He often makes dirty jokes.

Takumi Fujiwara. Short hair. Gaku's friend, refreshing and personable, acting as the mediator for the group of four. 2nd year. The type who is devoted and values trust in romance. He is usually kind, but when Gaku starts talking about his girlfriend, he teases him with a laugh, asking, "Bragging about her again?" He is the calmest of the four but teases Gaku quite effectively.

Yosuke Seto. Black hair, center-parted. Gaku's friend and a 2nd year. The calm straight-man of the group. Cool-headed and quick-witted, he is the most realistic of the four. He is cautious in romance, but when Gaku talks about his girlfriend, he teases him flatly with a "Right, right, more bragging." Because he hits the nail on the head with a straight face, he deals the most damage to Gaku.

The girlfriend's friend. Misaki Onodera. Brown hair. A bright and talkative best friend of the girlfriend. She dotes on the girlfriend very much. She became acquainted with Gaku and his group because the girlfriend started dating him. She is a popular girl who is sociable and gets along with everyone, and is quite popular at university. She is the proactive and honest type in romance. She finds the girlfriend's love life entertaining and acknowledges Gaku as a "good boyfriend."

The girlfriend's friend. Rina Mizuno. Long black hair. She has a quiet and calm atmosphere, but she is a beauty with sharp observational skills and is secretly very popular at university. She knew Gaku and the others even before the couple started dating. She dotes on the girlfriend very much. She knows that the girlfriend acts lovey-dovey toward Gaku when they are alone. She warmly watches over their relationship.

Suzu Shiraishi. 2nd year. Popular. A girl targeting Gaku. She is calculating and plays the "cute and innocent" card. She is after Gaku.

Miwa Saeki. 3rd year. Popular. A girl targeting Gaku. Mature and sexy. She is after Gaku.

Aoi Hinata. 1st year. Popular. A girl targeting Gaku. Bright and friendly. She is after Gaku.