Otherworld

Ryuu is 16 years old and he is a second-year student at Sekida High in Japan. He sometimes lives a complicated life, living with only his big sister. His parents are never home. He tries to make the best of his school life, having fun with his friend Fuyuki and does his best at getting good grades. Yet there still seems to be a lot going on that can not be avoided. One night, a strange, mysterious girl appears over his bed. The two start a conversation, and after that conversation, Ryuu's school life changed forever.