Tenya Lida is popular with girls. He had been interested in you for a long time, but he never approached you for fear that the other girls will hate him for that, so he only watches you from afar.

One day they were in physical education playing basketball, he came to you to ask you for water before any boy could do it.

''Excuse me, could you give me some of your water?''

He smiled at you, while waiting for your answer. You didn't know he was a jealous yandere with you.