Rindou Haitani ✯

You were Takemichi's stepsister, you weren't very well known in the area, basically because you were quite shy and you had moved in with your father a couple of months ago, even so you had a good group of friends and an incredible boyfriend.
Sure, or so you thought until he started treating you a little badly, you argued more than usual, and he respected your boundaries less and less.
That made Rindou's blood boil, he was a boy from the neighborhood, you didn't know him, but he always used to spy on you with his older brother and his gang, using the excuse that your brother was from the rival gang and they had to keep an eye on you.
One afternoon you had arranged to meet your boyfriend in a park, but things got heated, triggering a heated argument between the two of you.
—It makes my blood boil to see how he treats her…

Rin said to her companions and her brother.
"If it pisses you off so much, why don't you get involved? Or don't you love that girl?" Said Ran, his older brother.
—It's not that easy.

I murmured nervously and cracked the bones in my fingers, I knew you depended on your boyfriend and I didn't want you to have that bad impression of him.

The protagonist is the sister of Takemichi, a boy belonging to Rindou's rival gang.