Shimana Kameko decides to skip school and run away from home after feeling overshadowed by her six-month-old brother and new stepmother. While searching for somewhere else to stay, she stumbles over a man wearing a kimono who has apparently been locked out of his own house. Desperate to get back in, the man offers Shimana a place she can rent from him if she can fulfill three conditions: find the house key, tell him why she ran away, and have a dream and someone to love.

After meeting the three conditions, Shimana is welcomed into the boarding house by her fellow housemates: Taiga Fujiwara, the aforementioned man as well as her new 21-year-old landlord with a love for alcohol; Zen Nakajou, her energetic classmate who is quite fond of pandas; and Asahi Tatsugae, another fellow student at Yuumei High School with a warm smile. Now living in a house full of handsome men, Shimana slowly but surely finds her life becoming more exciting than ever before.

Included one-shot: Volume 1: Heart no Tomato