The Hallyuwave was a rising era for Korean idols in the Japanese music market. Artists such as Boa, TVXQ, Kara, Girls Generation, and more became huge success stories because of it.
The wave died down a bit, but groups within the new generation such as the top 2 girl groups Twice & IZ*One helped revamp it. Now, there is not only a huge surge of Kpop idols of Japanese descent debuting, but there are also Japanese (& Korean mixed) groups planning to debut within the country.
First comes JO1, a rookie 11 member boy group that came from Produce 101 Japan. Their image & concept follows the traditional Kpop style. Despite being new, their debut album surpassed 400k in sales.
There are also many groups set to make their debut.
JYPs Nizi Project is a highly anticipated girl group, with their show already gaining popularity in Japan, as well as worldwide, even amongst Korean fans.
Other groups with Japanese-Korean members are set to debut such as Orbit Union & Orange Latte.
There is Honey Popcorn too, although debuting in Korea only, are fully Japanese amongst its members.
There is also the upcoming boy group project called G-Egg, with Japanese & Korean members.
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I've said this over and over before, Kpop was going start putting in Japanese members into their groups, ever since the success of both Twice and IZ*ONE. There wasn't much Japanese members in any group until Twice blew up with 3 Japanese members and extended that success into Japan, which was unheard of in having 3 Japanese members in a group before. I believe Twice's enormous success started this trend and then IZ*ONE continuing that success brought even more interest in putting in Japanese members into their groups. Usually, there were more Chinese members before. But now, you're seeing an big increase in Japanese members.