I can’t say I’ve got all the clues to make it a coherent story: apparently, Kashima and her admiral have screwed up something, and to make up for it, Kashima has to let some guy use her. The admiral joins halfway, making it a threesome, and saving us from the netorare route that I was imagining…. and then NTR is back in full power with this “I’m so sorry Admiral, I don’t think I can be satisfied with just your dick anymore” stereotypical line.
So: that share isn’t for everyone, you’re warned ^^
We owe this release, apparently, to a person nicknamed ” 葛の寺” , thank you! O_o
I share something else (Yahari Ore Wa Hentai Love Come Ga Ii) by a mangaka called Yoshiki, but I would express strong doubt as to this being the same person, the art seems too different.