A collection of stories:
Although Monji (a student) is having a sexual relationship with Chiba, a friend from his circle, he's starting to doubt if he really loves him...?!
5-6. Chishiryoubun no Ai o Komete (Insert a Lethal Dose of Love)
Uchida's never ever been in love. He doesn't know what it's like to be restless and uneasy, to have his body heat up like it's on fire, to feel that tight pain in his chest. And then he meets Takahashi, and everything changes.
(Source: Yaoi Is Life & Vices and Devices)