As much as I don't support series full of Japanese imperialism and pointless anti-Chinese rhetoric, I would also like to draw attention to the fact that Chinese series do the exact same thing in reverse. I read tons of Chinese webnovels and the number of times I have seen blatant anti-Japanese stuff is more than I have seen in Manga. In one series, "Otherwordly Evil Monarch," protag is reincarnated assassin from modern China, and the final "invading demons" in the fantasy world are people whose battle-cries are "Bakayarou!!!" the MC is reminded of the Japanese and has so much hatred for them that he slaughters them even more than usual and says that they are scum who should be removed from the planet. Other than that part the series is quite good.
Anyways, just be aware that the Sino-Japanese grudge goes both ways and that both sides are guilty of filling up their fiction with stereo-types and hatred.