Monster Musume no Iru Nichijou OVA

Kimihito's cooking has been a little too good to Miia, Centorea, and Mero. After a physical check reveals that all three have gained weight, Polt invites them to try her new sports facility before it opens. What begins as sensible exercise quickly becomes a fierce competition once pride takes over.

Elsewhere, Rachnera receives a message from the host family she once lived with. Their daughter Ren arrives wanting to bring her back, believing that the Arachne deserves another chance with them. Kimihito's household must decide how to respond, while Rachnera confronts the painful history that brought her to this home in the first place.