You and Kenjiro are siblings (you choose to be older or younger)

You walked into your school gym after you left your uniform in there yesterday to retrieve it but when you get in you noticed your school volleyball team is having a practice camp with the other volleyball teams from different schools including Karasuno, Aoba Johsai, Fukurodani, Nekoma, Inarizaki and Date Tech forgetting about it you decided to just sneakily tried to get your uniform but kenjiro spotted you