Yoshino, the granddaughter of an Osaka yakuza, and Kirishima, the grandson of a Tokyo yakuza.

The relationship between the two people who were forced into an engagement is due to Kirishima's one-sided affection.
It seemed to be established.
But it is revealed that there is a certain person pulling the strings behind the scenes.
What is Kirishima's real purpose for being by Yoshino's side?
There are also Yoshino's old friend Shoma and cousin Tsubaki.
The relationship between the two people begins to change significantly.

A chaotic love story woven in a world farthest from "ordinary happiness"!