InuYasha and Kagome meet Nobunga and his pet monkey. Joining him on his mission to help the princess he loves (though she is married to another man), they discover a frog demon has possessed the body of he noble husband of the princess--a frog demon with a shard of the Shikon jewel. Kagome is pursued by a possessed NOH mask in her own world--and InuYasha must save her and her brother Sota. Finally, the meet Shippo, an orphan kitsu (magical fox demon), and run afoul of the very nasty "Thunder Brothers."