Kaibutsukun is the young prince of Kaibutsu land who decides to go to Earth to prove to his people that he is worthy of becoming king. Kaibutsukun is accompanied by his friends Dracula, Wolfman, and Franken. The Prince decides to go to Japan to visit his friends Utako and Hiroshi. The Prince, Dracula, Wolfman and Franken are in for a surprise.

怪物ランドの王位継承式の日、怪物くん（大野智）は国民から大ブーイングを浴びてしまう。怪物くんは何もかも投げ出し、お供を連れて日本へ。ところが、着いたところは日本ではなく“カレーの王国”。そこで怪物くんたちは権力者ヴィシャール（上川隆也）に頼まれ、反乱軍に捕らえられたピラリ姫（川島海荷）と王子様を救出しに向かう。