Oversummoned, Overpowered, and Over It! (Manga) Volume 2 by Saitosa

Enter: Masayoshi Date. A red-blooded man on a mission to prove himself, and nothing but the lamentations of a certain Inori Takafuji can sate his hunger for victory. He’s also a distinct thorn in everyone’s side and a total vibe killer. Inori is, of course, less than interested in putting up with the ramblings of a madman, but if there’s one thing he’s good at, it’s being a snake, and this situation is ripe for the swindling.

As the Kingdom of the Rising Sun plays host to heroes from foreign lands, their prodigal layabout hatches a plan of diabolically petty proportions.