The story is about the young elvish Princess Apricot (アプリコット ひめ) whose mission is to return to her homecountry of Fountain land before the total solar eclipse.

To prevent that from happening, she has been kidnapped by a mysterious cloaked man called Hoodman (フードマン), and his, rather clumsy, aides: Jack (ジャック) and Franz (フランツ).

The Princess's urgent call for help is accidentally heard by inhabitants of Bosco Forest: a brave and adventurous Frog (フローク), intelligent and ingenious inventor Tutty (タッティ), and cowardly, but kind and warm-hearted Otter (オッター).

On their way to Fountain land they get into myriad of adventures, where they prove their desire and ability to help and protect those who are in need, and where their own relationships between each other flourish and develop into strong friendship and love.

Background music in Bosco Adventure varies from colorful and cheerful, to moody, nostalgic and sentimental, with typical Japanese sounds.