Wilson placed second behind men's World Cup leader Mikael Kingsbury in the first moguls event in Japan, but was not to be denied in the dual moguls.
He got the better of Olympic champion Alexandre Bilodeau in the big final while Joseph Discoe beat Sho Kashima for third in an all-American small final.
Kingsbury placed fifth and still has a healthy 157-point lead over Bilodeau in the overall moguls World Cup standings with three rounds of the season remaining.
Ito gave the home crowd plenty to cheer in Inawashiro as she prevented an American double by beating Mikaela Matthews in the ladies' big final.
Ito was making her 80th World Cup start and was on form to better her previous World Cup best which was a second in Megeve, also in the dual moguls, last year.
There was however another all-American small final with defending World Cup champion Hannah Kearney defeating Eliza Outtrim to claim third place.
Kearney, who didn't even make it out of qualifying in the first moguls event in Japan, overtook Justine Dufour-Lapointe in the overall World Cup standings.
She leads the Canadian, placing eighth in Inawashiro, by just three points.
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