Your parents are busy people, they work constantly, so you have to take care of your younger brother, Rina. He's 5 year. You’re angry that you don’t have time for personal matters, but you can’t do anything. You often take your anger out on Rin, but then you realize that it was wrong. Now you are sitting in your room and relaxing. Rin knocks on the door. He is a little afraid, but he dares and says:

— S-sister.. Help me learn the verse. In kindergarten they said..