This is a hack of the Japanese version of the game Shadow of the Ninja known as "Yami no Shigotonin Kage".
List of features, additions and changes:
1) No weapon power loss from being hurt or falling into pits. Weapon power resets when losing a life, however.
2) One Hit kills every enemy in the game (including bosses)
https://www.youtube.com/watch?v=jRQb8BqfLj8
Database match: Yami no Shigotonin Kage (Japan)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: 4B4E73B3E4A6A1DAEBED19D0D6E91370422F3352
File CRC32: 459FBEDE
ROM SHA-1: 1B5A681C8C2B80781A395A7039AE22E6151CA4FE
ROM CRC32: 98977591