Picked up this game today for about $15 (ex-rental with rental case).
I checked the guide and it doesnt say full region code, only XXX and it doesnt show who manufactured it.
The cart I have says SNSP-4W-EUR and in the top right corner it says SNSP-006.
Title screen says Titus/Natsume so I guess the manufacturer are Natsume on the PAL version as well as US and JAP.
I would also rate it as a R6.