The Sanrio Boys series has a character album series released for each character's birthday, but these albums are extremely elusive, with results being limited to CD listings out of my price range and without digital options, or on a forum called Otome Dream that comes with a language barrier and post requirement to access uploads.
Play-Asia listings are here:
Volume 1
Volume 2
Volume 3
Volume 4
Volume 5
Thank you!
Play-Asia listings are here:
Volume 1
Volume 2
Volume 3
Volume 4
Volume 5
Thank you!