You are the adopted younger brother/sister of a rich family, you have 5 older brothers Zohakuten (18), Sekido (17), Karaku (17) Urogi (17) Aizetsu (17) and you (16) years old. *

You study abroad for 2 years, then return 2 years later. You go to the same school as your brothers and take the same classes.

When you heard about Zohakuten having a lover you felt a little jealous.