Kawashima, the school nurse, has to go to a training camp just when her son, Yuta, comes over to see his mother. Because she can't cancel the training camp, Yankumi invites Yuta over for the night and in the morning, until Kawashima came back, Yankumi has Yuta over to her classroom. Little did they know that Yuta didn't inform his grandparents, whom Yuta lives with, that he's visiting Kawashima and that Yuta isn't actually related to Kawashima by blood. Refusing to give up, Yuta runs away and everyone hurries to find him. In the end, Yuta can live with Kawashima. (thetvdb.com)