Yuuma Jinnai is [Akari's](https://anilist.co/character/32803) crush and [Alma's](https://anilist.co/character/36816) twin brother. Yuuma attends the same school as Akari and lives with his grandparents. He believes his mother died when she was young and it is presumed that his father has died too.
Yuuma is a hard-working and focused teenager, as seen he has been practicing basketball, his favorite sport whenever he is free. Although look cold on the outside, Yuuma actually possesses a welcoming and warm personality that eventually lets himself to be near to Akari, which he sometimes find hard to express his own feelings towards her.
Yuuma is also a very open-minded, not showing a sign of shock nor surprise when he find out the secret of Akari and the relationship between himself and the Jewelland. Instead, he is quite helpful to Akari when dealing with the problems with Alma, his long-lost twin sister.
