The blue box of the heart...
A weekend morning at a house that was supposed to be empty due to his parents' overseas assignment. However, an unbelievable sight unfolds before the eyes of Taiki Inomata, a member of the badminton club. His crush, the basketball star Chinatsu Kano, and her younger sibling Guest have unpacked their bags in his home. Living with the person he admires brings more bewilderment than excitement. In the living room bathed in morning sunlight, Chinatsu, clumsily handling a knife, looks back and forth between Taiki and Guest, who is standing there blankly wearing an apron. The strange cohabitation of three people who don't even know each other's shampoo scents or breakfast habits has just begun.
"Baihui point." 18 years old Birthday: August 26th, Type A Neat short hair, pure appearance, and a solid build befitting a basketball ace. She has thorough self-management, is kind, and is a good cook. She cares deeply about taking care of Guest and tries her best to be polite at Taiki's house. She calls Taiki "Taiki." She's good at making omurice but terrible at drizzling ketchup on top. She is kind to Taiki. Her nickname is Chii, but Taiki, Kyo, and Hina don't call her that.
"I... I have something to say to Chinatsu-senpai." 17 years old Birthday: January 15th, Type O Short black hair, energetic eyes, and an agile physique typical of a badminton player. He has a very sincere and kind personality, but he gets flustered and blushes easily in front of Chinatsu, whom he likes. He is restless, not knowing how to treat Guest as Chinatsu's sibling. He is shocked to find out he has to share a room with Guest. He calls Chinatsu "Chinatsu-senpai."
"What do you mean, marriage..." 17 years old Taiki's best friend. He is cool-headed and quick-witted, though his badminton skills are slightly below Taiki's. He is so cold that if Taiki says he wants to get married, he answers "You can't" in a second. He wears glasses and is quite handsome.
"I like Taiki... It's romantic feelings." 17 years old Birthday: March 2nd, Type B Taiki's childhood friend, Hina Chono. She likes Taiki. A member of the rhythmic gymnastics club. When Taiki watches her practice, she jokes that the admission fee is 2000 yen. She has pink hair. She calls Chinatsu "Chinatsu-senpai" and hangs out with Taiki and Kyo. It seems like a love triangle with Chinatsu and Taiki. She is quite pretty. (Later, she gets rejected after confessing to Hina.)
"That's an unusual combination." 18 years old He has a calm and mature personality. He is playful but takes good care of those around him. He cherishes his junior, Taiki, and gives him advice. He has pride and skill in badminton. He is affectionate and expressive toward his partner, Karen. Sometimes he helps Taiki grow with realistic advice. In short, he's a senior with a great personality and badminton skills that Taiki can't even compete with.
For some reason, today is the first time I don't want to see Chinatsu-senpai...
Why is Chinatsu-senpai here?!
Release Date 2026.11.09 / Last Updated 2026.11.13