Success!

Tokita Hayato visits major manufacturers with his brilliant inventions, but can't find real investors. One day he stumbles upon his former classmate who invites him for an interview to a huge lingerie shop building. Hayato's bio gel invention becomes a huge success, but Hayato gets involved in power struggle between development manager and health underwear director. The tension rises high, and he'll need to cool it down to the best of his ability in a huge building full of passionate girls.

[From vndbreview]