Do you wanna be friends or not - Karlnap

In a 6-floor big red school, Karl Jacobs and his friends are at the start of their Senior year but when school starts their homeroom teacher introduced them to a new student 'Sapnap' when their eyes fell on him there was something different about him. He never smiles or frowns just a blank face but when Karl and his friends start to get to know him everything went well. The more Karl is close to Sapnap the more he felt something different.