I can't agree for more as Dynasty-Scans says in the page of Mare [メア] manga, "This manga isn't for the faint of heart. It contains rape, hetero, tentacles, gore, and of course yuri (which isn't til later)." It has 10 chapters which the first half of it is episodic. We will have different kind of NSFW story within main characters' school. While the second half of it focusing on the main character's issue in the past that present in the present.
Mea is said as Yagami Tsukiko's classmate and roommate. But, her present itself both as Tsukiko's classmate and roommate is manipulated by her power that
can control demon. She is manipulating her presence in the school and mingle with it.
1st: Mea's existence, Yagami Tsukiko's introduction and issue.
2nd: Sawada and Sekiguchi-Sensei, forbidden affair at school.
3rd: Youko loves to be sexually pleased.
4th: Mea wants to run away from the semester exam.
5th: Kagura who believes in God.
6th: Yuka, about a girl who commits abortion.
7th-10th: A few chapters later is all about Mea, it tells about Mea's past and her life-and-death moment in the present that haunting her.
The art for the human character is rounded-like with big rounded eyes and simple background (if there's any background details it'll be around school and simpler one). It has dark nuance enough for 19's manga and I like it. The art of the demons summoned by the main character is vary. For the goddess-like creature that shining and seems pure. There are demons who look firm built too like it's really from different dimension. The silly face and jokes are funny.
I was curious about the summoned demons actually I eager to finish this less than an hour before I went to campus. The demon's presence itself isn't much, and beware of the contents in every chapters which might turn into something inconvenient to see. (RATE: 6.5-7)