[Alice Academy] First Quarter Moon

Ten-year-old Serio Rei thinks he is the least qualified person in the world to be happy, but someone tells him otherwise. 15-year-old Serio Rei thinks he is the least qualified person in the world to be happy, because that person left. 25-year-old Serio Rei thinks he is the least qualified person in the world to be happy, but a fool says to give him happiness.