Handyman Saitou in Another World, Vol. 8

Lafanpan is a moonlight fairy, a race cursed by the goddess of the moon. Unless they offer gold coins during the full moon, their bodies will shrink until they are gone. One day, Lafanpan receives a key to the Crystal Tower from a raven. Legends say that the curse can be lifted at the top of the tower. So, Saitou and his friends head to the Forest of Moonlight. However, this forest is home to the ones who prey on fairies--the insect people, a race that suffers under a different curse...