Ponkotsu Dai Shuryou-chan to Ossan Sentouin-san.

The secret evil organization Gokuark has been annihilated by the heroes. Its grand leader and her subordinate Saitou barely made their escape and have begun living in a rundown one-room apartment, but... Can this useless shut-in (but cute) grand leader revive the organization!?

(Source: Kadokawa, translated)