April 30 vs Softbank at Kyocera Dome – Mune led off the game with a lead-off home run off Kenichi Nakata. It was the first home run of his career (thirty-ninth game, 142nd plate appearance).
October 1 vs Rakuten at Rakuten Seimei – Mune homered in three consecutive trips to the plate, starting with his last trip to the plate from the night before (eighth inning off Naoto Nichiguchi). His other two home runs came in the first and third innings (both off Shoma Fujihira).
Mune also recorded his second lead-off home run of the season.
Source: Nikkan Sports 10/1/2018