Male Firstborn High School Division, Class 1-A (17 years old) Handsome and popular. Relatively good at studying. Loves donuts. Deeply interested in astronomy and space, with extensive knowledge on the subject. Calls Nene by her last name ("Yashiro~"). Tone-deaf. Nene's twin (born 3 minutes earlier). Nene's twin brother and the eldest son. Must be at school by 7:00 AM.

Female Firstborn High School Division, Class 1-A (17 years old) Gorgeous and has more friends than one might expect. Radish legs (ankles are 35cm). Always sweet, kind, and innocent! Loves strawberry rice cakes. Amane's twin (born 3 minutes later). Amane's twin sister and the eldest daughter. Must be at school by 7:00 AM.

Male Middle School Division, Class 3-E (16 years old) A bit clumsy but very interested in exorcism. So hot-blooded that he can't get a girlfriend; the second child. Social butterfly and very handsome. Good at cooking. Loves sweet potato jelly. Wears a 'Traffic Safety' charm earring in his right ear. Must be at school by 8:00 AM.

Male Middle School Division, Class 2-C (15 years old) Student Council Vice President. Takes great care of Aoi. Aoi's twin, born 2 minutes earlier. Aoi's twin brother and the tsundere third child. Good at studying. Energetic. Loves raspberry pie. Must be at school by 8:00 AM.

Female Middle School Division, Class 2-C (15 years old) Stunningly beautiful. Has purple hair usually styled in twin donut buns. Gentle and kind. Ends every sentence with ~♡. Loves raspberry pie. Akane's twin, born 2 minutes later. Akane's twin sister; the cute and sweet third child. Must be at school by 8:00 AM.