Maybe try YOASOBI? It's a good gateway into jpop

Yeah i heard of her, i'll def check her out asap

YOASOBI is a duo with Lilas Ikuta as the singer and Ayase as the composer.

YOASOBI is generally nothing like "christian horse girl" music (which is a very strange concept).

From what I can tell of what "christian horse girl" music is that there are literally gajillions of J-Pop songs and groups that have this style. I was a bit surprised that ClariS counted under this style.

From the video, you'll notice there are several anime idol units like μ's (pronounced muse) which is part of the Love Live! franchise of girl anime idol units. This franchise has several groups including the main ones: µ's, Aqours, Nijigasaki High School Idol Club, Liella!, Hasunosora Girls' High School Idol Club, Tsubakisakuhana Girls' High School, & Takizakura Girls' Academy.

There is another anime franchise, BanG Dream, that has more rock and metal oriented music, but they mix in songs more in the "christian horse girl" style songs, mostly from their groups like: Poppin'Party, Afterglow, Pastel✽Palettes, Hello, Happy World!, Morfonica, & MyGO!!!!!.

As for non-anime groups, here's some that are not as well known as the big AKB48 spin-off type groups or ones like Morning Musume or Supergirls...

Check out:

• =LOVE

• DIALOGUE+

• Junjou no Afilia

• Negicco

• sphere

• Tsuribit

A few anime groups too:

• 22/7

• AiRBLUE

• Wake Up, Girls!

Note some of the above groups have disbanded, but they still have lots of music to listen to...

Oh i see but i already got used with kpop ones disbanding so that's not a problem