Towa moves in the Niwa household as a maid. A new student, Mio Hio, arrives in Daisuke's class. She turns out to be a little more than the class bargained for and on top of that, holds a deadly secret. Satoshi saves Daisuke in swimming class by performing CPR on him. Dark takes Risa on a date, which makes Daisuke depress in the end.