The Fourth Holy Grail War has begun, and seven mages must summon heroes from history to battle each other to the death. Only one mage-and-hero pair will remain to claim the Grail and have their wishes granted! Kiritsugu Emiya was once an assassin but now fights in this war to save the world from those who would destroy it with the Grail’s power.

There are three of the Minami sisters: Haruka, Kana and Chiaki, who have an average life. The girls only have each other to depend on and help each other get through everything from love confessions to cooking.

Riki Ryugasaki is a school boy in this town. He wants to be an adventurer when he grows up and his favorite word is “mystery.” Riki has a lively personality, but can be a bit of an airhead at times - he marches to the beat of his own drum. One day Riki is taken to his first B-Daman event by his friend and classmate, Sumi Inaba. Although he doesn’t participate as a player, Riki’s natural curiosity sparks an interest towards B-Daman. And when Riki hears an urban legend about “a secret B-Daman tournament (a tournament that only a very selected group of players are allowed to participate)” spreading amongst the children of the town, he realizes that there is something very mysterious and exciting about B-Daman...

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