Kimihito Kurusu shares his home with several monster girls under an Interspecies Cultural Exchange program, beginning with the lamia Miia who was placed with him by mistake. This two-part OVA expands moments from the manga. The first is a chaotic physical examination day for housemates including the harpy Papi, the slime Suu, the dullahan Lala, the arachne Rachnera, the centaur Centorea and the mermaid Mero. The second follows Rachnera's former host family as they try to reclaim her. It supplements the TV series rather than standing on its own.