This isn't a magic trick

 Shingo looked over Seiji… no, he was judging the latter.

"You don't seem like you're lying… What danger could Chiaki possibly be in?"

Seiji and Chiaki exchanged glances and came to an unspoken agreement.

"Dad, when I've said earlier that Seigo was a high school detective, I was lying." Chiaki admitted the truth. "He's actually a spiritual ability user."

Shingo: "…"

The famous artist showed a strange and obviously disbelieving expression. Meanwhile, Seiji slowly raised his hand.

Suddenly, the teacup on the table began to float in midair!

Shingo's expression changed to one of surprise upon seeing this.

Seiji manipulated the teacup and had it spin circles in midair right in front of Shingo. Seiji next sent the teacup flying up and down, then around Shingo's head in a circle, and finally around the entire room before it landed on the table again.