Kyoya Kusunoki sent a casual daily life with his excellent brother Toyoya, a transgressive but weak younger sister Saya, and a silent father's Totoku. My brother disappears and my father died suddenly.
She tries to live quietly with her younger sister Saya, but she is drunk under the condition that Ryujin's play is the father of Akane Kozuki. That is to take the lead before graduating from a high school where Ryushu is the chairman.
The Kogetsu family is one of the largest conglomerates in the world and boasts overwhelming power in Japan. If Saya's future matter is implied, it cannot be refused.
School life begins in this way, but students and teachers routinely meet with them.
Finally, when he was at a loss as he was sentenced to refuse to participate in the "Physical Arts" training, he found a gate in the basement of his house . The gate was a gate that connects the different world Arius and the earth.
Kyoya decides to train in this different world Arius and goes through the gate of adventure.