From DMP:

"The person I love is you, Haru!"
Haru is shocked by the sudden confession from his best friend Kazushi and the passionate kiss that follows! However, he can't bring himself to see the perfect and widely admired Kazushi as anything more than a friend. Determined to win Haru's admiration and love, Kazushi steals a kiss every chance he can get. How long can Haru ward off his increasingly strong and bold advances?