忍者くん 魔城の冒険 / Ninja-kun: Majyou no Bouken (Demon Castle Adventure). Just a question of what romanization method you want to go with for the subtitle.
The JajaMaru games seem to be spin-offs of the main series and, among other entries, there is both a Ninja JaJaMaru-kun (忍者じゃじゃ丸くん) and a Jajamaru no Daibouken (じゃじゃ丸の大冒険).
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