おとせサンダー (Otose Thunder) is the major debut single of Japanese musician ぼっちぼろまる (BotchiBoromaru), a high-energy pop-rock track that arrived in maimai DX FESTiVAL PLUS at launch on March 23, 2023. The title plays on the imperative verb "otose" (to strike down or release) paired with "thunder," fitting the song's electrified, driving character at 177 BPM. ぼっちぼろまる handled composition, arrangement, lyrics, and vocals himself, while the music video was directed by まご山つく蔵 (Magoyama Tsukuzō). The game-length edit was cut by rintaro soma to a 2:31 playable length. Active since 2017, ぼっちぼろまる is also well known within the SEGA rhythm-game community as one of the hosts of SEGA's official music program, "SEGA音" (SEGA Music Room). He later contributed a second song, トノサマビーム (Tonosama Beam), to the maimai series. おとせサンダー itself has traveled beyond maimai, appearing in beatmania IIDX and CHUNITHM SUN PLUS, making it one of the more cross-pollinated rhythm-game picks from this era. In maimai, the song's five DX charts span from a straightforward Basic (level 3) to a punishing Re:Master (level 13+, constant 13.7). The Expert chart (9+) was designed by 翠楼屋 (Suirouya), the Master chart (11) by 緑風 犬三郎 (also known as Happy), and the Re:Master chart by Jack, whose 976-note arrangement pushes the thunderous motif into dense, high-speed patterns that demand strong stamina and precise slide control.