Tsutomu's parents used to run a flower shop. But they passed away several years ago, and he lives with his older brother and his wife, Mai, since then. Mai runs the flower shop now, and he is forced to help her. One day, a beautiful woman comes to the shop. She is Kozue, Mai's former senpai back when they were still students, also starts to work at the shop. Unlike his elder brother who prioritize work over family, Tsutomu proves to be the man Mai can rely on. One night when Mai got drunk while being frustrated of her husband...