with another left hook soon after. These two knockdowns awarded Shinohara an automatic technical knockout victory under the K-1 tournament rules. He needed just 25 seconds to advance to the next round. Shinohara advanced to the tournament semifinals, where he faced Kenta Hayashi. Hayashi first knocked Shinohara down with a right hook, before stopping him with a right cross at the 2:31 minute mark of the first-round. Ten days later, on December 18, Shinohara vacated the Krush super lightweight title. Move to lightweight Shinohara faced the 2018 K-1 Lightweight Grand Prix finalist Fumiya Osawa at K-1 World GP 2019: K'FESTA 2 on March 10, 2019. The fight was judged a unanimous decision draw after the first three rounds, with scores of 29–29, 29–29 and 30–30. Accordingly, an extra round was contested, after which Shinohara was awarded the unanimous decision. Shinohara faced Shinichiro Kawasaki at K-1 World GP 2019: Japan vs World 5 vs 5 & Special Superfight in Osaka on August 24, 2019. The pair previously fought at DEEP KICK 23 on December 21, 2014, with Shinohara winning by unanimous decision. He won the rematch in the same manner, with all three judges scoring the fight 28–26 in his favor. Shinohara was knocked down with a left hook at the 2:02 minute mark of the second round, but was able to knock Kawasaki down twice before the end of the round himself. Shinohara was rewarded with this two-fight winning streak with the chance to challenge the reigning Krush Lightweight champion Kongnapa Weerasakreck, in the main event of Krush.113 on June 28, 2020. He lost the fight by unanimous decision. Two of the judges scored the fight 30–28 for Kongnapa, while the third judge awarded Kongnapa a 30–29 scorecard. Shinohara faced the former two-weight K-1 champion Koya Urabe at K-1 World GP 2020 in Osaka on September 22, 2020. Urabe won the fight by unanimous decision, after an extra fourth round was fought. Shinohara was expected to face the former Krush Super Featherweight champion Yuma Saikyo at K-1: K’Festa 4 on January 24, 2021. The entire event was later postponed as the Japanese prime minister Yoshihide Suga declared a state of emergency for Tokyo, due to the COVID-19 pandemic. Shinohara and Saikyo were rescheduled to face each-other at K-1 World GP 2021: K’Festa 4 Day.2 on March 31, 2021. Shinohara lost the fight by split decision, with scores of 30–29, 29–30