Tomoyuki moved away from his family and experienced student life in the dorms. Time passed quickly and his graduation day arrived. While walking on the familiar road to school with his best friend, Tomoyuki saw a familiar figure. A beautiful smile full of love... a beautiful woman appeared, the stepmother he had always missed and respected, Ririko. To celebrate her son's graduation, Ririko went out for drinks with Tomoyuki. After drinking too much, Tomoyuki had to take her back to the dorm. But just as he was about to leave, Ririko stopped him and gave him a gift he would never forget for the rest of his life...