Otherside Picnic 4: Overnight on the Otherside (裏世界ピクニック４ 裏世界夜行 Urasekai Picnic 4: Urasekai Yakou) is the fourth novel in the Otherside Picnic series. It was released in Japan on December 19, 2019 and December 27, 2020 in English. The series is written by Iori Miyazawa and illustrated by shirakaba.
Winter is coming. Having been attacked by a group that worshiped Satsuki Uruma, Sorawo and Toriko head to the cult's former base—the Farm in the Mountains. The other world is still chock full of all kinds of dangerous mysteries, but the allure of exploring the unknown is ever present. Sorawo prepares for more adventures with Toriko, but the most terrifying of threats is silently closing in on them. Not to mention the fact that it seems there's something Toriko needs to tell Sorawo... There's no turning back now—a whirlwind of bizarre exploration and survival is upon them!
- File 12: The Matter of That Farm
- File 13: Pandora in the Next Room
- File 14: The Inviting Hot Springs
- File 15: Overnight on the Otherside
- Works Referenced (Vol. 4)