OVA included with special edition of volume 5 of the Mikakunin de Shinkoukei manga.

Mashiro and Kobeni share with each other a story from their pasts. Kobeni retells an episode of her childhood with Benio and Nadeshiko while Mashiro describes one of her days back on her home in the mountains.

After participating in a lucky draw, Hakuya Mitsumine wins first prize: tickets for a trip to a hot spring of his choice. Hakuya's sister, Mashiro, wishes to visit a specific hot spring in a village surrounded by intriguing rumors about alleged sightings of mysterious creatures in its area. Supportive of his sister's pick, Hakuya, along with Mashiro and a few friends, heads to the village.

When the group ventures into a dark forest determined to catch a glimpse of the creatures, their pursuit is instead hindered by multiple uncanny mishaps. Strayed from what was supposed to be a simple goal, the group is determined to find the creatures or else they will return home with their curiosity dissatisfied.