Numata Shizumu is a reclusive Japanese indie developer active in the late 2000s–2010s. Their known works (based on JP fan wikis) include:
Many third-party repack sites are known to bundle malware or ransomware with their downloads.
If the game won’t start, you may be missing parts 01, 02, 03 – common in split repacks.
Communities like or VGBA (Video Game Preservation Archive) sometimes host legal backups of abandoned freeware. Read their rules – many allow downloads if the original link is dead and the dev approves.