A plane crash leaves a girl with bug knowledge stranded on an island where insects are the size of buildings, and the show's idea of survival horror is watching what those insects do to human bodies. The gore isn't window dressing, it's the entire point, graphic and sustained in ways most anime won't touch. This is a one-episode commitment to genuine biological horror that doesn't flinch, doesn't cut away, and doesn't care if you're comfortable watching it.

During a school trip, an airplane crash leaves Oribe Mutsumi and her classmates stranded on an island that appears to be deserted. Mutsumi tracks down the other survivors and puts her wilderness know-how to work helping them. She figures rescue should come in roughly three days, which seems easy enough to wait out. What she did not plan for is that the island is home to enormous killer insects. Her understanding of creatures like butterflies and wasps may be the one thing that lets any of her classmates live until help arrives. The single OVA episode mixes action, horror, mystery and thriller with ecchi elements, and it was released alongside the sixth volume of the manga it adapts.