Ep. 3: Tahanan dan Kebajikan

Kazuma, Aqua, and the three members of Tanya's unit involved in the heist undergo a hellish detention with demonic bugs entering their bodies. Emilia asks if there is a way to end their detention faster, and hears that they might be able to get out if they perform a "good deed." Later, in science class, Megumin creates a miniature explosion with her classmates' help, blowing up the water pipes and flooding part of the school. The detention group uses their magic powers to divert the flood away from the Principal and the school, earning his favor and getting themselves out of detention early. (Source: Wikipedia)

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