Just before jumping, I suggested to my classmate, “Let’s have sex!” is a Manga/Manhwa/Manhua in english language, manga series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

A shocking romantic comedy has arrived! My first love, Koga Kurumi. Her beauty and personality, which are beyond what you’d expect from a high school student, invite jealousy, isolate her, and – she was on the verge of jumping off the roof due to bullying. So, what can I do…? “Let’s have sex!” I’ll scream out my love to the death and make a place for you in this world!