Suto teamed up with Francis Boudreau-Audet in the spring of 2015. They decided to represent Japan in senior pairs, coached by Richard Gauthier and Bruno Marcotte in Montreal, Canada. Their international debut came in December 2015 at the Golden Spin of Zagreb, where they placed 7th. Later that month, they won the Japanese national title, ahead of Marin Ono / Wesley Killing and Miu Suzaki / Ryuichi Kihara.