Issei's completely unhinged response to a panty thief actually wielding a philosopher's stone is peak DxD absurdity, and the show knows exactly how dumb that premise is. The comedy lands because the cast treats supernatural lingerie crime with the same dead-serious urgency they'd use for actual apocalypse-level threats. If you've made it this far into the franchise, this OVA is exactly the brain-off, character-focused nonsense you showed up for.
Issei and the Occult Research Club find themselves in a compromising situation when a miscalculation during a supernatural experiment goes hilariously wrong. What was supposed to be a routine magical practice becomes an awkward comedy of errors as the club members struggle to undo the effects before anyone notices what's happened. The situation only gets worse when unexpected visitors show up, forcing everyone to scramble and cover their tracks. Between the frantic attempts at damage control and the increasingly ridiculous explanations, tensions run high and tempers flare. The episode plays comedy through physical humor and the characters' desperate improvisation, leaning hard into the absurdity of their supernatural school life. It's pure slapstick chaos wrapped in the series' signature blend of fantasy elements and comedy. For fans who love the Occult Research Club's dynamic and enjoy episodes where the gang's plans spectacularly backfire, this captures exactly what makes their interactions entertaining: watching competent people completely lose control of a situation and having to think on their feet to survive it.