Haiyore! Nyaruko-san F

Mahiro Yasaka is still surrounded by his alien friends, who protect him from vicious monsters. Nyaruko dreams of getting closer to him, Cuuko adores Nyaruko, and Hasta would not mind a relationship with Mahiro either. Thanks to these otherworldly housemates, even the most ordinary events in his home become unpredictable and chaotic.

One morning starts with good news: a classmate has bought everyone tickets to a new attraction, a game that offers its participants an escape from reality. But while everyone else is having a carefree time, for Nyaruko it turns into a trap. Together with Mahiro, she finds herself surrounded by hostile aliens.

Nyaruko cannot use her weapons, because an unknown force instantly neutralizes them. Space nanomachines intend to strip her of her strength and abilities and turn her into an ordinary human, and before Mahiro's eyes she begins losing both her memories and her powers. Mahiro will have to find a way to save her before it is too late.

Haiyore! Nyaruko-san F is an OVA continuing the Lovecraft-parody romantic comedy based on Manta Aisora's light novels.