Rokurinka (六厘歌) is the official company song (社歌) of Rokurinsha (六厘舎), the celebrated tsukemen (dipping ramen) chain operated by Matsumatsu Shokuhin Co., Ltd. The track was added to maimai でらっくす PLUS (maimai DX PLUS) as a lighthearted April Fools' Day promotion, originally announced for April 1, 2020, but delayed by over two months to June 19, 2020 due to the COVID-19 pandemic. During the promotional period, the official maimai website even briefly rebranded as "maimai でらっくす TSUKEMEN" in reference to the restaurant's signature dish. Despite its novelty origin, Rokurinka received a full chart suite including a Level-12 MASTER designed by チャン@DP皆伝. The chart is notorious among veteran players for its relentless slide patterns, drawing comparisons to the equally slide-heavy Believe the Rainbow, and its extraordinary Break-note count of 130, one of the highest for a Level-12 chart in the DX series. As a thematic touch, every note in the MASTER chart is rendered as a hexagon (六角形), mirroring the "six" (六) in both the restaurant name and song title. The chart also features a dense short-Hold rush during the guitar section that demands precise timing. Rokurinka was removed from the maimai DX series on March 23, 2023, making it a time-limited track that is no longer playable in standard rotation. The in-game DX Collection leans into the food theme with rewards such as the "UMA" icon (unlocked by Full Combo), the title "つけめんを文化に" (Make Tsukemen a Culture), and the nameplate "おなかすいた～！！" (I'm Hungry~!!), with collection art illustrated by longtime maimai contributor Happy (はっぴー).