The comedy here isn't trying to build toward anything, it's just Issei being Issei while increasingly absurd things happen around him. A possessed Issei who shares his exact perversions is the kind of stupid premise that only works because the show commits to it completely. These episodes exist in the space where ecchi stops pretending to be anything other than what it is, and somehow that honesty makes it funnier than it has any right to be.
Issei's ordinary perverted life takes a turn for the bizarre when a strange rumor sweeps through school: girls are vanishing and returning mysteriously smaller in certain areas. The investigation pulls him and his supernatural crew into increasingly ridiculous situations that somehow manage to get worse. When a cursed Egyptian sorcerer possesses Issei's body, things spiral into absolute chaos. The possessed Issei now shares his body with someone even more insufferable than himself, and the only way to fix this nightmare is to break an ancient curse. The catch: the sorcerer's obsession with forcing a devil into marriage mirrors Issei's own romantic disasters, creating a comedy of errors where everyone's incompetence becomes the saving grace. These OVA episodes lean hard into the franchise's blend of supernatural comedy and fanservice, delivering side-splitting moments that exist outside the main timeline. Perfect for viewers who want pure comedic chaos without worrying about continuity, and who appreciate when anime decides plot coherence matters less than making you laugh at increasingly dumb magical mishaps.