The Dirty Way to Destroy the Goddess's Heroes, Vol. 5 (light novel) - Asagi Tohsaka, Sakuma Sasaki

After narrowly escaping the Goddess’s assaults by burrowing deep into the demon world’ Shinichi is desperate to find a way to counterattack. However’ even when he scans the ancient texts to get a leg up on her’ he doesn’t seem to come up with any solid leads. That’s when he stumbles across the location where the Red Dragon has been slumbering all this time. Could he give them the edge they need to take down the deity? Gearing up for their final fight’ Shinichi realizes he needs to act now if he wants a shot at taking down the Goddess for good!