Two years ago, the death of Naoto Watari's parents left him as the sole caretaker for his younger sister Suzushiro "Suzu" Watari and forced him to move in with their aunt. So devoted is he to Suzu that he refuses to join clubs or even hang out with anyone, earning him snide comments and the title of "siscon" at his new school. But as long as Suzu is safe and happy, Naoto doesn't care what everyone else says. However, his sneering classmates may turn out to be the least of his worries. The sudden transfer of a girl named Satsuki Tachibana brings back traumatic memories from his past-a past she had a hand in making so unpleasant. Nasty secrets, unknown to Naoto, begin to surface with her arrival, threatening his new life.

Sasaki, un oficinista, compra un pájaro que puede darle poderes sobrenaturales para cruzar entre mundos. Aunque quiere usar ese poder para vivir en paz, hay varios personajes que pueden interponerse en sus deseos.

Sigue a Oliver Horn cuando ingresa en una prestigiosa escuela de magia llamada Kimberly. Descubre que no todo es lo que parece, con la aparición de laberintos, monstruos y otras amenazas.