
Quick answer — Ritsuko Okazaki worked on Princess Tutu (Theme Song Performance), Fruits Basket (Theme Song Performance), Sukitte Ii na yo.: Dareka ga (Theme Song Performance) and 2 more anime.
Ritsuko Okazaki worked on Princess Tutu (Theme Song Performance), Fruits Basket (Theme Song Performance), Sukitte Ii na yo.: Dareka ga (Theme Song Performance), Love Hina Christmas Movie (Theme Song Lyrics), Love Hina Spring Movie (Theme Song Lyrics).