After moving out of home and finishing dorm life, Yuu is nearing graduation. On his way home from the ceremony, he reunites with his stepmother, Marina, who runs up to him with a bright smile—reigniting feelings he's long kept buried. That night, celebrating his graduation, Marina gets drunk and asks Yuu to escort her to a hotel. As emotions surge uncontrollably, she gently stops him from leaving the room, whispering, "Accept this graduation gift from me..." before kissing him. And so, Yuu takes his first step into adulthood.