Yo-yo Ihoujin Youta!

Youta is an elementary school student who loves yo-yos. One day, when he tries to use the "Infinite Yo-Yo" he's been waiting for, he's summoned to another world! In this world, yo-yos become the most powerful weapons!? To protect the peace of the world he's wandered into, Youta's adventure begins now!

(Source: Shueisha, translated)