超最終鬼畜妹フランドール・S is a Touhou Project doujin arrangement that arrived in maimai DX PRiSM PLUS on May 21, 2025. The track is a collaboration between two established figures in the Touhou arrangement community, ビートまりお (Beat Mario), a core member of the long-running circle COOL&CREATE, and まろん (Maron), a fellow arranger and vocalist. Credited together as ビートまりお×まろん, their arrangement runs at a brisk 210 BPM and is built around Flandre Scarlet's iconic theme "U.N.オーエンは彼女なのか?" (U.N. Owen Was Her?) from the 2002 bullet-hell classic 東方紅魔郷 (Embodiment of Scarlet Devil). The title translates roughly to "Super Ultimate Sadistic Little Sister Flandre S," and the "超" (chou, "super") prefix, along with the new collaborator credit, distinguishes this version from Beat Mario's earlier arrangement "最終鬼畜妹フランドール・S," which had been playable in maimai since the FiNALE version (2019). Where that original track used STANDARD charts across five difficulties (including Re:Master), the PRiSM PLUS incarnation is a DX-exclusive release with four difficulty tiers incorporating Touch notes. The Master chart sits at level 13+ with a 13.9 constant, designed by Luxizhel, while the Expert chart (level 12+, constant 12.6) was crafted by 鳩ホルダー. Available across Japan, International, and USA regions, this arrangement represents both a continuation of maimai's long-running relationship with Touhou doujin music and a heightened take on one of the series' most recognizable character themes.