Can someone please tell me what manga is this http://www.mangago.me/read-manga/heart_stop...

It's most likely a new manga that hasn't been translated. It's a collab work by Izumi Katsure (author) and Kanda Neko (illustrator)

I lost count of how many times people asked about this illustration in the last days! I'm not criticizing but it seems that it caught the attention of many. Well done Kanda Neko! :)