I Don't Know Ninjutsu but I'm Ridiculously Strong

Igarashi Starry Night, who travels to the world of Naruto, cannot possess chakra! I can't learn any ninjutsu! But fortunately Starry Night got the Zanpakutō Scabbard System! Every time you draw your sword, you will randomly get a Zanpakutō from the Shinigami world, and gain all the abilities of the original owner! Sanshouyu Hanzo: "Water Release: Shark Bullet Technique!" Starry Night: "Sit upright in the frosty sky, Hyōrinmaru!" Uchiha Shisui: "The most powerful genjutsu Beitami!" Starry Night: "Break it! Mirror Flower, Water Moon!" Uchiha Madara: "Do you want to dance too?" Starry Night: "Dancing? Eat me and the blade will flow like fire! Fire and Fire Ten Trillion Death Burial Formation!" This ninja obviously doesn't know ninjutsu, so why is he so strong? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.