Oversummoned, Overpowered, and Over It! (Manga) Volume 3 by Saitosa

Fenrir—an elden beast bound by an ancient pact to protect. Inori Takafuji—just some guy. A seemingly one-sided battle becomes a cruel experiment as the cynical scoundrel himself goes up against a veritable monarch of the canids. But Inori isn’t the only one conspiring against thrones. As anyone with eyes could have suspected, all is not well in the Kingdom of the Rising Sun... Perhaps the undead layabout’s encounter with the great wolf was but an omen of things to come.

Can two estranged sisters bridge the rift driven between them since birth? Who is the mysterious entity looming behind the scenes? Will Inori EVER get to sleep in again?