|Light Novel||Vol. 1|
Isshin has deep blue hair and eyes, he also wears a glasses and usually seen wearing his school uniform.
He has a back stabing personality. He wants to become king. He once betrayed the new adventure club members to get his hands on a Nanana Collection
Yu is a third year member of adventure club who has crush on Isshin.
|Nanae Island Third High School Adventure Club Members|
|Isshin Yuiga||Yū Ibara||Jūgo Yama||Tensai Ikkyū||Dark Hoshino|