Saikyou Densetsu Kurosawa

Saikyou Densetsu Kurosawa summary:

44 years old, single, working in a construction company for his entire life. All Kurosawa wants is a little respect from his co-workers. And a little popularity won't hurt. Unfortunately Kurosawa's plans fail miserably from time to time and one day, he finds himself right in the middle of a fight against...delinquent middle schoolers?