Tomozuna stable
In November 2018 Kaisei returned to the "sanyaku" ranks at "komusubi" for the first time in 13 tournaments. However, he was restricted by a left calf injury suffered in training shortly before the tournament, missing the first two days and then withdrawing on Day 14 with only three wins, after aggravating the injury. He was also forced to withdraw from the May 2019 tournament after injuring his right bicep tendon against Ryūden on Day 7. Fighting at "maegashira" 15 in July, he injured his right arm and eventually withdrew on Day 11 with only one win, resulting in his demotion to "jūryō". He returned to the top division after an 11–4 record in November 2019. He was forced to sit out the January 2021 tournament after a wrestler at Tomozuna stable tested positive for COVID-19.