Negai wo Kanaete Moraou to Akuma wo Shoukan Shita Kedo, Kawaikatta Node Kekkon Shimashita: Akuma no Niizuma

Synopsis & Lore

Mercenary guild member Theo Asper was the weakest of the weak. Due to this, he was constantly switching parties, with no place to call his own. Desiring to grow strong, he decides to summon a devil to grant his wish... An herbivore man and carnivore devil, this is a slightly naughty (?) story about attaining happiness― (Source: Earth Star Entertainment, translated)