If you're looking for anime similar to Octopidae, you might like these titles.
Kou Outori a normal high school student who experiences a repeating dream of being eaten by a beast from inside himself. When Kō meets Reiichi Kuki, the elite student who rules his school, the encounter awakens hidden powers inside him.
A man posts his dissatisfaction with everyday life on social media. He gets lost in GeGeGe Forest.
The official music video for the Vocaloid song Welcome to the Star Inn, by the producer Kikuo.