This show knows the joke is that nobody can take a shrine festival or a cooking competition seriously when your cast includes a chainsaw-wielding zombie and a demon crying about freeloading. The OVAs don't waste time on plot, they burn through absurdist gags at the speed of someone who understands that the funniest thing about supernatural comedy is watching normal school events get absolutely derailed by supernatural stupidity. You're here for Ayumu's deadpan suffering and Haruna's chaotic energy, and these episodes deliver both at full throttle.
Ayumu's chaotic household grows even more unpredictable when Haruna decides to take charge of the local shrine's Spring Festival. Armed with her usual magical-girl enthusiasm and zero regard for practicality, she turns what should be a simple community event into complete mayhem. Meanwhile, Seraphim attempts to prove her worth by cooking for the household, with predictably disastrous results. Things spiral further when a concentration game competition at school becomes an unexpectedly brutal battle of wills between Ayumu and his friend Orito. The second half shifts gears entirely as the group heads to a swimming pool, then scrambles to prepare an impromptu birthday celebration for Hellscythe. Haruna's interpretation of party planning is, naturally, spectacularly unhinged. These episodes lean hard into the series' comedic sweet spot: low-stakes slice-of-life scenarios that escalate into absurd chaos thanks to Haruna's complete inability to do anything normally. Expect plenty of physical comedy, unexpected heart, and the kind of ridiculous decision-making that makes this franchise's particular brand of humor work.