Ningen Shikkaku is a Manga/Manhwa/Manhua in english language, Tragedy 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

Yozo Oba is a troubled soul incapable of revealing his true self to others. A weak constitution and the lingering trauma from some abuse administered by a relative forces him to uphold a facade of hollow jocularity since high school.