February 27, he was selected to play for Japan national baseball team at the 2019 exhibition games against Mexico. His great performance during the pre-season exhibition games earned him the 3rd base spot in the season-opener. This made him the youngest Swallows player to start in the season opening game at 19 years old, beating the previous record of 21 year-old Seikichi Nishioka in 1958. He hit his 10th home run by May 10, and managed to secure the clean up position by May 12. He got voted into his first All-Star Game in July where he got top votes for 3rd base, and was also selected for the Home Run Derby showdown. On August 12, he hit his first walk-off home run against the Baystars and became the youngest NPB player to achieve this feat. He hit his 30th home run by August 22, and became the first Central League player drafted out of high school to notch at least 30 home runs within 2 years from his debut. On September 4, he broke the NPB RBI record of high school drafted players in their 2nd season by notching his 87th RBI. He was the only Swallows player to appear in all of the team's 143 games, and despite batting at only .231, he topped the team in home runs with 36 which tied the NPB home-run record for 2nd-year rookies, and finished 2nd in RBI with 96. On the other hand, he set a new league worst strikeout count amongst Japanese players with 184. His performance earned him the 2019 CL Rookie of the year award, and a 37 million pay rise which more than quadrupled his previous salary to 45 million yen. 2021 Murakami won the Central League MVP award following the 2021 season. 2022 In 2022, Murakami became the first NPB player to hit a home run in five consecutive plate appearances, over the course of two games. On September 13, 2022, Murakami hit his 55th home run of the season, tying Sadaharu Oh for the most home runs by a Japanese player in a season, and for second in NPB overall, alongside Alex Cabrera, Tuffy Rhodes, and Oh. Unfortunately for Murakami, he would go on a slump, going 48 straight at-bats without a home run, but on the final day of the regular season, on October 3, 2022, Murakami would hit his 56th home run