Tutor of Sawada little sister

What if Tsunayoshi Sawada has a younger sister? ?And what will happen after this younger sister is indeed much, much better than Sawada Tsunayoshi? ?Will he steal the limelight as the protagonist's older brother?No!Won't! !No pride, no arrogance and extremely easy to get along with, Sawada Tsunayoshi's sister always supports her brother behind her back!Although she is always implicated in the mafia fights, she never complains. On the contrary, she does not stop strengthening her strength to make herself stronger, so strong that she can help her brother and the others!Watch how she grows!