https://www.doujinshi.org/book/1012950/
RAW: http://e-hentai.fbk.tokyo/index/g/1079488/4feaa4b49e/

Base +50, ZenFroz +9, Luna_Flina +35, TheOldDeus +5, hiorto +6, jfragrettel +8

The most vanilla story from this artist...
Glad Umi gets some sweet vanilla though...

Base +23, as102 +9, TouhouPairings +6, LegoArielFanMaster +8, Chaotic Anonymous +6, TheOldDeus +5, finnick8 +7, Desynchronizer +12, jfragrettel +8, Refon_S +10, ruby56 +6

A non rape Umi doujin. I feel like I'm in paradise.

Base +8, Refon_S +10, DiedrichVK -6, Azura Meta -6, Chaotic Anonymous +6, Josh0975 +6, TheOldDeus +5, finnick8 +7, jfragrettel +8, ruby56 +6, dj756 +6

Sweet Umi-chan doujin is sweet~
Especially when you know what corori is known for.

Base +7, TheOldDeus +5, jfragrettel +8, dj756 +6

It's been two years since an Umi doujin like this was last translated.

Base +3, TheOldDeus +5, finnick8 +7, jfragrettel +8

Why the lower res compared to the RAW?

Base +33, TheOldDeus +5, LegoArielFanMaster +8, traficantj +16, jfragrettel +8

Translation of the author's note:

Yappari Oni? Circle:CORORI
Thank you very much for reading to the end!
This time it's a story of consensual sex, unlike my usual.
I like to draw different things, so I decided to do this for once.
It's still just trial and error, I try my best!
There are still so many things I want to do with Umi-chan, so I'll draw them one-by-one!

Base +6, elitecore +5, Wehwei +6, Desynchronizer +12, jfragrettel +8