People in Konoha: You Can Become Stronger by Taking in a Younger Brother

Bai Yu traveled to the world of Naruto and unexpectedly got a unique system. It's okay if you can't practice ninjutsu on your own! As long as you have a younger brother, you can become stronger! When school started, I stood on the podium and introduced myself, "My name is Bai Yu, your future boss!" Uzumaki Naruto: "What? How dare you want to be the boss of the future Hokage?" Uchiha Sasuke: "This person's strength is not inferior to mine! If you want to be my boss, you must kill Itachi!" Sarutobi Konohamaru: "It's not that I can't be your little brother, but you have to help me defeat my Grandpa Hokage!" Bai Yu: "I will grant all your wishes, as long as you become my little brother!" Iruka advised, "Baiyu, don't be so arrogant on the first day of school!" Bai Yu: "Teacher, how about you become my little brother too!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.