Crossover: The Nightingale's Wanderings in the Port Mafia

After the leader killed himself,

Shiratori Sayaka, who had planned to follow in his footsteps, was inexplicably bound to a mission System.

Her reward for completing the missions would be to resurrect her former leader.

She agreed to the deal without hesitation.

But after being taught by the Number One Hero, the Master of the Demon Slayer Corps, the kindhearted God of the Shinobi World, and others,

Shiratori Sayaka suddenly understood.

Fists are what matter most.

If you want someone to stay, you have to persuade them physically.

The resurrected Boss Dazai: ...

Who taught his little nightingale such bad habits?!!