Other characters:
 |
Wataru Minakami - their older brother |
|
Mami
- the undercover girl posing as a sister (Season 1)(Season 2 cameo) |
 |
Akio
- Wataru's friend (Season 1) |
 |
Yamada
- fellow student on Promised Island who becomes friends with Wataru
and likes his sisters (Season 1)(Season 2 cameo) |
 |
Dream
Girl - a mysterious girl linked to Wataru's past along with a
promise (Season 1) |
 |
Jiiya/Jeeves
- Wataru's butler and the multitasker (Season 1) |
 |
Minai
- Wataru and Akio's classmate/friend in Tokyo (Season 1) |
 |
Jiiya - Aria's
maid/caretaker (Season 2) |
