Morino Kento lost his father early and has been living with his mother since. His second year at Aketo Hanabue Private Academy includes a school trip to a place where his cousin already lives — familiar enough that he expects nothing remarkable. What actually happens is a sequence of encounters that are remarkable: Shishikura Ouga, an extremely shy girl from a lineage associated with exceptional strength, draws him into a commotion he did not anticipate; Karakuchi Hibana, an ojousama from a different school visiting the same destination by coincidence, decides he is a hero worth knowing; Amaeda Chiwa, his cousin's best friend, becomes someone new; and Aijou Michiru, who works in the shopping district of the tourist area, respects him for reasons she explains. The trip ends quickly. The story of what comes after it — the relationships now in motion, the people who have become part of his life — is what begins when the bus returns home.