Desire for a Reply! is a Manga/Manhwa/Manhua in english language, One shot 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 oneshot by Nisioisin and Miyokawa Masaru. Sunaki is a back-up player on the baseball team and he finally gets the courage to give a love letter to the idol of the school. Where will his actions take him?