Sou, Atashi-tachi wa Konna ni mo Rifujin na Sekai ni Ikiteiru no dara yo 3 * Kono Sekai de 2 no Hatsubai Yotei wa Arimasen.

Kako becomes Nozomi's permanent partner for defusing magical bombs. All the bombs in the current world have been defused, but there is still a threat coming to the neighboring world, so our team sets off there to eliminate the threat.

[From vndbreview]