Takamine Kyomaro's lazy life suddenly turns upside down as a mysterious kid named Gash appears in his room, claiming to be his 14th birthday gift.

Gash has no memory of his past and doesnt know anything about his own identity and his only belonging is a red book that is written in a non human language.

However,By saying "Zakeru", kyomaro accidentaly triggers Gash to release a huge amount of lightening through his mouth.

Shocked, Kyomaro decides to act normally in order not to ruin his own peaceful life, but when other creatures like Gash try to find and attack him, Kyomaro tries to defend Gash and win over attackers by using the words in the book.

It turns out, there are 99 other creatures like Gash in this world and they're seeking power by knocking down each other. Who will stand out?

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Side story: Gekijouban Konjiki no Gash Bell!! 101 Banme no Mamono
Side story: Gekijouban Konjiki no Gash Bell!! Mecha Vulcan no Raishuu