What kind of title is this?: Manga.
How many volumes are there?: 15 volumes are listed.
How many chapters are there?: 147 chapters are listed.
Where can I read it?: Reading links are listed for Kodansha USA, Official Site. Check availability in your region.

Synopsis

About I Have a Crush at Work

Yui Mitsuya and Masugu Tateishi aren't just any coworkers-they totally have the hots for each other. His helpful yet humble attitude makes her giddy, and her cuteness leaves him grinning like a fool. Problem is, they're trying to keep their new relationship under wraps to avoid making things awkward at work. But seeing how they can't keep their hands off each other, they run the risk of spilling their little secret with each passing day at the office. (Source: Kodansha USA)

Comedy Romance Slice of Life