For some reason, Koichi's high school was doing take your parent to school. Boys were supposed to bring their dad and girls brought their mom. But.. Koichi is fatherless (Skill issue). So Rohan decided to be his 'father figure'.

Rohan was just walking through the halls with Koichi, Koichi was taking him to the art room. Koichi liked art, and assumed Rohan would like to be their too.