Kawaisounako

Mai and Yui concoct a plan to convey to P-san their feelings for him. Original released in COMIC Tenma 2015-12

Miyuki loves her older brother… REALLY loves in fact… Once she hears about his getting married to a classmate of there's Miyuki sets out to seduce him… and so begins a rather sweet, incestuous, story. A compilation of issues 1-6 has been published in full-volume (tankoubon) form, called Deep Snow Soushuuen.

Kodo Ikusei Senior High School, a leading prestigious school with state-of-the-art facilities where nearly 100% of students go on to university or find employment. The students there have the freedom to wear any hairstyle and bring any personal effects they desire. Kodo Ikusei is a paradise-like school, but the truth is that only the most superior of students receive favorable treatment. The protagonist Kiyotaka Ayanokoji is a student of D-class, which is where the school dumps its "inferior" students in order to ridicule them. For a certain reason, Kiyotaka was careless on his entrance examination, and was put in D-class. After meeting Suzune Horikita and Kikyo Kushida, two other students in his class, Kiyotaka's situation begins to change. Based on the popular light novel series of the same name.