Bizarre, fetishy concept, but actually really sweet!!
Yuri is a closeted gay that starts visiting aquariums with autistic-coded Ogasawara. Like my man has one interest and no people skills. Yuri's interest in Ogasawara inspires weird wet dreams with various sea creatures, so awkward, what do.
I, a connoisseur of Japanese erotica, have come across a few tentacle themed hentai (which, from my understanding, came about because you didn't have to censor tentacles so they were a way to bypass censors but to get real nasty with it!)
I love that this manga "went there," even made sense, and then, uh, kept it there. The relationship was so, so sweet. 10 stars!