"When you lose something, there is something that you remember." Hinata Wahei, a 28-year-old professional house-building planner, with the sole ambition to start his new single lifestyle, was suddenly forced to live together with three sisters from his father's second marriage. The unforeseen co-existence is filled to the brim with trouble, as Wahei adheres to a self-sufficient, no-family-sentimentalisms personal code, having been raised as an only child in a family marred by divorce. A story about a small family of four. It's a tale that goes from "I'm home" to "I'm off", and from "building a house" to "building a home".