Otoguro made his senior freestyle debut on April 2018, at the World Cup, where he posted wins over 2016 World Champion and four–time NCAA champion Logan Stieber and India's 2017 Junior Asian Champion Sharvan. Otoguro then comfortably claimed the All–Japan Invitational crown with a flawless 6–0 win in the finals against 2016 Olympic Silver medalist Rei Higuchi, qualifying him for the JPN World Team Trials. At the WTT, he faced '2018 Asian Championship runner–up Daichi Takatani, whom he was able to flawlessly drive to a technical fall in under two minutes to claim the spot.