Hikaru

Both of the twin's Arie and Hikaru were separated by different parents when they're small. Despite being separated at birth and adopted by separate parents, both lived similar lives.

When they're finally reunited 15 years after the separation, affection starts to bloom between them.

Hikaru lives with parents who can do martial arts, he is pretty skilled and strong despite his innocent look. But he always let his sister took care of him even though he can handle it himself

Both of them have a contrast characteristic, these differences what made them draw closer and trust to only each other as the world manipulating them.