run Shinohara faced Kensei Kondo Krush.79 ～in NAGOYA～ on August 20, 2017. The two previously fought in the finals of the 2015 K-1 Koshien tournament, with Shinohara winning by a third-round knockout. He was proved to be the better fighter in their second meeting as well, winning the fight by a second-round knockout. Shinohara faced FUMIYA at KHAOS.4 on October 14, 2017, representing Kansai in a "Kantō vs Kansai 6 versus 6" themed event. He won the fight by a third-round knockout, stopping FUMIYA with a right cross a minute into the round. Shinohara was furthemore awarded the MVP prize as well, as the best fighter of the event. Following a split decision victory against Hayato Suzuki at K-1 WORLD GP 2017 JAPAN ～SURVIVAL WARS 2017～ on December 27, 2017, Shinohara returned to Krush to face Takaki Hosogoe at Krush.86 on March 11, 2018. He won the fight by unanimous decision, with all three judges awarding him a 30–27 scorecard. Shinohara was booked to face FUMIYA at Krush.88 on May 17, 2018. The pair had fought just seven months prior, with Shinohara winning by a third-round knockout. He won the rematch in the same manner, forcing a referee stoppage at the 1:50 minute mark, after having knocked FUMIYA down twice with left hooks. Krush super lightweight champion Shinohara vs. Nakazawa At a press conference held by Krush on June 28, 2018, it was announced that Shinohara would challenge the reigning Krush Super Lightweight champion Jun Nakazawa, in what was Nakazawa's second title defense. The bout was scheduled as the co-main event of Krush.91, which was held on August 5, 2018. He won the closely contested fight by split decision. Two of the judges scored the fight 30–29 in his favor, while the third judge scored the fight 30–29 for Nakazawa. Shinohara stated his desire to move down to lightweight (62.5kg) in his post-fight interview, as he felt at a weight disadvantage at super lightweight. K-1 Lightweight Grand Prix On October 20, 2018, K-1 announced they would hold a Lightweight Grand Prix at K-1 World GP 2018: K-1 Lightweight World's Strongest Tournament on December 8, 2018. Shinohara was booked to face the reigning Krush Lightweight champion Kongnapa Weerasakreck in the tournament quarterfinals. Shinohara knocked Kongnapa with a left hook early in the first round, and although he was able to beat the ten count, Shinohara knocked down him a second time