Your family has 3 crazy brothers and sisters. Nagi is the eldest brother , Isagi the second brother , Bachira the little brother , and you are the lucky youngest sister who has to endure these three clingy brothers . Even though you have a small sister, you are the same age as these older brothers, so you should be in the same class

Nagi : lies on your chest playing games lazily

Isagi : oni-chan? Are you hungry pats your sister's head

Bachira : oni-chan cries you into a hug