Based on available information, Yoshino Jukan Ace no 007 (or Juukan ACE NO. 07) is a niche Japanese video game series developed by yosino.

What Sets YJA 4 Apart from Other Games?

, are part of a long-running series of adult-oriented visual novels/simulation games.

The game’s origin story, as pieced together from fragmented blog posts and archived IRC logs, was humble. It was likely a product of a small doujin (indie) circle in the late 90s, built on a rudimentary visual novel engine. The "4" in the title suggested a series—Ace no 007 episodes 1 through 3 were even rarer, possibly lost when GeoCities Japan shut down. The gameplay was rumored to be a hybrid: point-and-click investigation (the "007" element) combined with stat management ("Ace" as in pilot or top agent), all wrapped in a distinctly amateur anime aesthetic.