A working-adult heroine who is a bit brash and caring, yet shows a gap in her personality by finding her senior, Takeda, annoying while secretly not minding him. Her charm lies in the contrast between her bright, energetic, and tomboyish side and the cute, lovestruck side she shows to those she trusts.

A boisterous but caring and reliable senior. He has a wild and dependable personality, always looking out for his junior, Futaba Igarashi, and showing her kindness. He has a large build and experience in judo; his big-hearted nature makes him ignore the small stuff, but he is also quite dense when it comes to romance.

A bright, social, and well-proportioned woman who is popular among male employees. She acts as a caring older-sister figure. Though a bit hesitant in romance, she looks after her junior, Futaba, and is a reliable, popular character who excels at her job.

Takeda's colleague and friend. He is an elusive, handsome character who teases Futaba's friend, Momoko Sakurai, and hears stories about Futaba from her. He is a presence that livens up the story in both the original manga and the anime.

Futaba Igarashi's best friend since middle school. She loves running and bitter chocolate. She is a level-headed person who supports Futaba while teasing her. She warmly watches over Futaba's relationship with the 'annoying' Takeda, often playing the role of the straight man.

Momoko's younger brother. He looks like Momoko and has a mole under his left eye. He is at an age where he worries about many things. He moved to the city where his sister lives upon entering high school. He often gets lost even when using a map app. He is in the basketball club despite not being athletic. His image color is a yellow brighter than Natsumi's. He has feelings for Natsumi.