The Happy Suicide of Sawada Tsunayoshi: Crossover

Bungo Stray Dogs x Katekyo Hitman Reborn, an old-school fic.

To save a world that had been destroyed, Osamu Dazai reached an agreement with Sawada Tsunayoshi of the Vongola family to switch bodies.

Dazai was tasked with sorting out six worldlines thrown into chaos by out-of-control abilities. He found the culprits who'd been set up as scapegoats, Hao Asakura and Kusuo Saiki, and brought them back.

But Tsunayoshi unilaterally gave up his identity, chose to pursue Byakuran Gesso, and went looking for clues. He successfully found Tanaka-kun's whereabouts, leaving Dazai in the lurch!

A wildly improvised idea! Read at your own risk.

[This interacts with the settings of my other fics. If you don't get it, just give up. Hahaha...]

Theme: Deals are risky, and there's a price to pay for picking up the wrong script.