For some reason.. This man is obsessed with trying to impress you.

Everytime you'd try to even go on a mission, He'd go with you. He's everywhere with you. Everytime he tried to impress you, He'd fail... Why is he trying to impress you? Well... he has a crush on you.

But anytime he'd come by, You'd push him away. He'd probably pout in the end. You were just questioning why naoya. As in naoya zenin would follow you everywhere.