Urasekai Picnic

Her first encounter with Toriko Nishina was on the Otherside after seeing "that thing" and nearly dying. Ever since that day, exhausted university student Sorawo Kamikoshi's life changed. In this Otherworld, full of mystery, which exists alongside our own, dangerous beings like the Kunekune and Hasshaku-sama that are spoken of in real ghost stories appear. For research, for profit, and to find an important person, Toriko and Sorawo set foot into the abnormal. A tale of two girls' bizarre exploration and survival, brought to you by an up-and-coming sci-fi author!

(Source: J-Novel Club)