My complete first impression after watching this was: "I would let my future son watch this." The only issue with this OVA is that it is a standalone episode, so much that it confused viewers when Season 2 started because if you believed the events were canon, a few things would be rearranged/retconned. The essence of this OVA isn't completely unique to this series either, which makes it seem like filler. However, Konosuba greatest asset is that it is a very character driven show, and this OVA in particular uses its casts and their strengths, flaws, and relationships to its fullest to bring a comedic andecchi-tastic extravaganza for your hot blooded male entertainment.