It is probably a Japanese game, here are the things I remember:
- a little boy roaming streats, can jump and use a close contact weapon
- enemies look like different type of streetwalkers who harm our character on contact
- weapon can be simple punch, convert to a knife and then to a sword (by gaining japanese words which come out of fallen enemies and fly upwords)
- on some levels, character cannot jump high and hits the roof with a big sound (no harm)
- on some special levels, the character flies a plane like object
- when the game ends, a sexy little anime like girl pleas to continue

