Keshigomu Kareshi summary:

The day of high school entrance exam, Sena gave half of his eraser to a boy who seems to be troubled. When Sena successfully entered the school, unfortunately he never saw him again.Two years later, when Sena had almost forgotten about it, a flirtatious boy named Koga, comes from America and transfers to his school. Koga begins his search for the "Eraser Goddess" he fell in love with at the first sight on the day of his entrance exam. Sena realizes that he has been mistaken for a girl and runs away desperately, but...?The fresh boys are in love with each other in a cute and innocent way!