Urasekai Picnic

Synopsis

College student Sorawo Kamikoshi is trapped in a bog pool in another world, afraid she'll die alone, when another woman named Toriko Nishina stumbles across her and pulls her out. The two then encounter a monster called a "Wiggle-Waggle" that will supposedly turn them insane if they look at it for too long. Toriko throws some rock salt at the monster and it turns into a strange cube with reflective surfaces. The next day, in the real world, Toriko tracks down Sorawo and asks her to help hunt more Wiggle-Waggles to sell them to a specialized researcher. After encountering another Wiggle-Waggle, the rock salt does not work, and neither does the pistol that Toriko carries with her. After staring at the Wiggle-Waggle for several seconds, Sorawo perceives the real form of the monster long enough for Toriko's pistol to shoot it.

(Source: Wikipedia)