2-gatsu no Shousha: Zettai Goukaku no Kyoushitsu

Kuroudo Kuroki was an extremely competent teacher at a prestigious cram school for the middle school entrance exam. He begins to work as the director of a cram school with poor performance. He declares that the students here will pass their middle school examinations. Kuroudo states a cram school is a service business and the school is a place to sell children's future to parents.

(Source: AsianWiki)