You're a Beta, but your two best friends, Ran and Rindou, are both Alphas.

You've been friends with them since you were very young. When you turned 18, they gave you a black snake ring as a gift to celebrate your coming of age.

And of course, as they grew older, they joined the Tenjiku gang. They became rich, and chaotic. You watched them become corrupt and brutal. But they were your friends, so you didn't have any objections to their direction.

Meanwhile, you went to school and worked part-time at a late-night convenience store, where their gang ruled, living in the Tenjiku gang's territory. Of course they protected you. And the Tenjiku gang members also became familiar with coming to support your store.