Chinpira

"I liked that woman, but she called me a wimp. I thought to myself, I only became a thug because I'm a wimp. A wimp and a thug are two words for the same thing."

On a whim, Osamu, a low-level yakuza, takes in and hides Keiko from his fellow gang members, who were searching for her. When he wakes up in the morning, Keiko is already gone. When he goes into the office, he discovers that Keiko is a mistress of his gang boss. Eventually, Keiko is caught and she asks Osamu for help, what will he do......?

(Source: cmoa, translated)