Kurokosagi Jingai-san to Kenkyuuin-kun.

A researcher who has loved living creatures since childhood is out in the forest for a routine survey—until something huge suddenly drops into view from the sky!? For a moment, he fears he’s about to be eaten… but instead, the massive creature—a mysterious *Kurokosagi*—starts cozying up to him and growing more attached with each encounter. (Source: Comic Porta, translated)