Otherside Picnic (Manga) 14

Winter has come, and Sorawo and Toriko go on a fun hot springs trip with Kozakura! But when Sorawo and Toriko bathe alone together, there's a hint of danger in the air... Meanwhile, the intrepid duo's preparations for a nighttime Otherside expedition are proceeding apace. However, a terrible threat from the past is quietly creeping closer, while Toriko seems to have something she needs to tell Sorawo.

Volume 14 of the Otherside Picnic manga series by Eita Mizuno.