Tomoyuki left his family and experienced student life in a remote dormitory. Time passed quickly and his graduation ceremony had arrived. While walking on the familiar route to school with his best friend, Tomoyuki saw a familiar figure. A beautiful smile filled with love... a beautiful woman appeared, the stepmother he always missed and respected, Ririko. To celebrate her son's graduation, Ririko went out drinking with Tomoyuki. Because she drank too much, Tomoyuki had to take her back to the dormitory. But when he was about to return, Ririko stopped him and gave him a gift that he would never forget in his whole life...