I recommend:
1.
Yaida "YAIKO" Hitomi's Candlize:For anyone who hasn't heard Yaiko yet, buy this album, it's wonderful. It's so much better than that mainstream Ayu stuff though she has become quite popular. She has a very unique voice and very different music and instruments that make this album my current favorite. She also writes the lyrics and music for all her songs.
2.
Yaida "YAIKO" Hitomi's Air/Cook/Sky:This is probably my second favorite album at the moment. Once again Yaiko has her unique voice and instruments, and about 90% of this album is upbeat electric and acoustic guitar. Songs like Are You Ready? Boy have very different instruments from the usual J-pop, and in all the songs Yaiko shows her high energy and vocal skills.
3.
Chihiro Onitsuka's Ultimate Collection-This best album gets the third spot for my favorite album of the moment, but is a drastic change from my other two choices. About half this album is dark, kind of depressing music, and half is inspirational, slightly happier music. Songs like Gekkou, infection and Shine are really some of Oni's strongest songs on this album and all show how powerful her vocals are. Fly to me and We can go are happier songs that I still found enjoyable.
This is only recommended to those who only own one or none of her albums as it would be a waste to buy all the albums and get all the songs, though a few are B-sides, considering the album art is minimal and there is only one picture of Oni in it excluding the front and back of the case...