From what i remember the main character gets hit in the head by something before having a fight with his rival. when he wakes up he's doing you know what with his rival, he soon finds out that he's in another world and in the world he's dating his rival.
From what i remember the main character gets hit in the head by something before having a fight with his rival. when he wakes up he's doing you know what with his rival, he soon finds out that he's in another world and in the world he's dating his rival.