do u guys know any manga/hwa or maybe animation that had a scene where the character stuck in the small cave in a cave (or running away from smth) an then they meet someone who also in the cave (and maybe helping them out) and turns out the person who helped them is already dead... ughh help me scratch my brain to memorize the title

so im reading this dj on that one site that already dead, its about kageyama who eat a biscuit that contain "love potion" and it made him loves hinata for 1 day, its so fluff that made me want to read it again!!