Power of a smile

A story including Valhalla, Toman, Tenjiku and other gangs. The story is totally different from the real Tokyo revengers. But it starts from the time after Takemicchi mets Mikey and joins toman. It is not an time travel based story. It starts from there and goes on till bitten arc and continues. It may be confusing, so read to find out.

Y/n, Taiju's Shiba's sister, is a aspiring fighter. From ever since she was on her diapers until now, she is desperate to become a gang member. But her strict brother doesn't allow it.

Adding to the trouble, she gets messed up with a few other gangs. Leader of Tenjiku, Haitani brothers, South and many more are chasing her.

What did a 17 years old do to trigger every fierce gang members?