Tomoyuki left his family and experienced student life in the dormitory. Time passed quickly and his graduation ceremony 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, his beloved stepmother, Ririko. To celebrate her son's graduation, Ririko went out for drinks with Tomoyuki. Because he drank too much, Tomoyuki had to take her back to the dormitory. But as he was about to leave, Ririko stopped him and gave him a gift that he would never forget in his lifetime...