From Chuang Yi:

Shunichi Domoto is an athletically talented fifth grader, but when Seito Hojoin - a gifted Spinner - utterly defeats him in a simple yo-yo match, Shunichi is determined to have a rematch with his new rival...by signing himself up for the international yo-yo championships!! With only days left to pick up new yo-yo skills, can he master enough techniques to beat the competition?