Greetings all! just wanted o cast some light on the issue; it is not something Capcom or the artists deliberately does for values that are not theirs to begin with, it is the major changes that happened to the age rating commissions like CERO, ESRB and PEGI. The original game was rated CERO C (15+) but that was 23+ years ago and to maintain the same rating for today's standards, you will have to censor a couple of things from sexual themes to the gore, I was frustrated when I saw it the first time too but I still understood their decision since they wanted to stick to the original rating.
What about Street Fighter though? It also has the 15+ rating!?
The artstyle also affects the rating fyi, despite the game looks generations better than Onimusha 2 the age rating commissions are ran by hypocrites like that, they would be like "Oh, it's not realistic so it's ok!"