Japanese Sheet Music sites?

I pray that everyone doesn't mind that I'm dedicating my first post to jumping to the problem, rather than introducing myself ^^.

I am a 10 year pianist, with the bass guitar being my next passion, some of my favorite songs to play being.. well, Anime stuff.

I know several sheet music collections dedicated to anime, like Ichigo's and Josh's, but unfortunately this is only the American/English side of the world, where there are only few anime lovers in the musician/transcriber world.

That's why I did a bit of googling, and found this site. If there are any native Japanese speakers, I just wanted to know, are there any sheet music sites dedicated to anime in the Japanese world? （Edit: I don't ｍｉｎｄ if it's a pay site, at ｌｅａｓｔ I can see if it exists or not, so I can go on transcribing without worry.)

I would find out myself, but...
おれの にほんごわ けっこ まずい だから。。。

Something like this @amazon?
バンドスコア アニソン スーパーコレクション
Band Score Animation Super Collection

Or you should trust your ears like him, JR train songs