Dead Dead Demon's Dededede Destruction, Vol. 8  (English, Paperback, Asano Inio)

It's just an everyday apocalypse. Three years ago the aliens invaded Tokyo. Nothing was ever the same again. But after a while, even impending doom starts to feel ordinary. The Occult Club's trip to the seaside has been a great chance for Kadode and her friends to unwind from the dual stresses of college and living through an endless alien invasion. Oba and Makoto forge a special friendship after hanging out on the beach, culminating in the two of them taking a scenic tour through Oran's memories from another timeline! Too bad it looks like every timeline is the worst timeline...