Takeshi, an ordinary guy, finds himself unexpectedly whisked away to the enigmatic Weiss Schwarz Battle Space after a study session with Michi, the school's most stunning girl. In this alternate dimension, a quirky old man reveals Takeshi as the chosen warrior tasked with winning card battles to return home. The catch? Takeshi is clueless about the game. Luckily, Michi steps in as his mentor, guiding him through the whimsical and comical world of card battles, preparing him for the ultimate showdown. That is, if Takeshi can endure the rigorous training ahead.