Zeikin de Katta Hon is a Manga/Manhwa/Manhua in english language, COMEDY 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

Ishidaira is a delinquent who visited the library for the first time since elementary school. He discovered that he still hadn't returned a book he borrowed 10 years ago. He ended up having to work part-time at the library to pay for it. This is the beginning of a manga that makes you want to go to the library after you read it