Celestial Crossing

In this visual novel you play as Hikaru, a high school student who sleeps all day and plays his favorite game all night.
Though one day trough a series of events he does not yet understand, these two worlds collide and his in-game avatar is now standing in his bedroom. He will now have to learn how to live with Nerith, a barbaric elven warlock who does not understand civilized concepts such as laws, morals, or pants...