From MangaHelpers:

Gekibuno is a 4koma comedy centered around Kuramoto Souya, a new transfer student to the high school. Souya is the kid in the class that no one pays attention to. He has no personality, is always depressed, has no hobbies or is not involved in any extracurricular activities and is just plain boring. He wants to be different at this new school and start on a fresh plate but unfortunately life isn’t that easy and he goes back to his old self. Souya is coerced into joining the drama club, where the most colorful characters of the school reside. Will this drama club be able to transform Souya into a different person? [vyc]

Kuramoto has just transferred to a new school, which has a Drama Club with a touch of mystery around it.

Kuramoto has a retiring personality, and he feels like his existence is barely noticed by others. He wants to change all this, so he joins the Drama Club.

But soon... he regrets! Commencement of a stupid comedy!