He didn't just "get" the belt. He spent seven years refining himself so that when the ZECTer finally arrived, it didn't choose him—it acknowledged him. There’s something deeply haunting about Kagami’s struggle in this episode—the "chosen one" trope is subverted by a man who made himself the only choice.
: As a Worm attack escalates, the specialized "Kabuto Zecter" (a sentient mechanical beetle) is deployed by ZECT to be used by their designated operative. However, in a surprising twist, the Zecter rejects the ZECT agents and flies straight to Tendo. kamen rider kabuto episode 1
The Worm's next target is a young girl—. Hiyori witnesses a Worm attack and becomes the prey. Kagami, who has been assigned to protect her, attempts to summon the Kabuto Zecter , a device he believes will choose him to become the Rider. But fate has other plans. He didn't just "get" the belt