Urasekai Picnic - MangaDex

The story is set in the modern world, but there exist doors that can take people to the "other side," where strange urban legends and internet stories prove to be true. College student Sorawo Kamikoshi finds herself exploring one of these doors, and almost dies on the other side, when she is rescued by another girl named Toriko Nishina. Toriko is a mysterious girl, but very skilled with a gun, and she seems to be searching for someone else on the other side. Together, both girls start to explore these doors to the other side.

Read Urasekai Picnic Vol.3 Chapter 13: Kisaragi Station Vii - Mangadex

2020 Fall Anime Season: First Impressions

Read Urasekai Picnic Vol.3 Chapter 17: Time, Space And A Middle-Aged Man Iv - Mangadex

Clube do Terror: Urasekai Picnic

Manga Rec Thread, Page 4

Mag Talk - Monthly Shounen Gangan (Shounen Mag by Square Enix), Page 17

DISC] Urasekai Picnic - Chapter 56 : r/manga

1 Chapter 5 - Urasekai Picnic - MangaDex

Manga & Books

Hiyori Scans

Mag Talk - Monthly Shounen Gangan (Shounen Mag by Square Enix), Page 15