The family shuttled between black and white, but she, who had an extraordinary family background, personally wiped out her family, and she has been known as a "sinner" ever since. The three people were childhood sweethearts, but there was a estrangement due to family reasons. It was unknown whether they would hurt each other or help each other. When he was in danger, he was rescued by a person - Oshima Yuko. They just met, but they gradually became an irreplaceable family member. Enter the realm of delinquent girls with her - Masuka Academy and start a new life. Passion, struggle, and unwillingness to admit defeat, this is the powerful friendship between bad girls! "I will definitely do what I promised. This is my promise to you!" Along the way, I met many partners and understood what "bonds" are. Originally I was just living a calm life with occasional fights, but at that time it changed - what should I do? "These are the ones I should protect with my life, they are my family!!" This is my first time writing this, so please forgive me if it's not good x. I will try to write as much as possible about the fighting! !