一か罰 (Ichi ka Bachi) is a maimai original song contributed by the Japanese doujin music circle 豚乙女 (Butaotome), first appearing in maimai でらっくす (maimai DX) on October 18, 2019. The title is a deliberate wordplay on the classical Japanese gambling expression 一か八か (ichi ka bachi ka, "sink or swim" or "take a chance"), which originated from dice games where rolling a one (一) or an eight (八) decided the outcome. By swapping the character 八 (eight) with 罰 (punishment or divine retribution), the song reimagines the phrase as "one or punishment", raising the stakes from mere loss to karmic consequence. Composed by コンペ (Compe) and sung by ランコ (Ranko), both core members of Butaotome, the track is a driving rock piece at 196 BPM that matches the circle's energetic doujin-scene style. The lyrics depict a narrator caught in a cycle of defeat and exhaustion, "losing and losing, assaulted by endless waves", yet still reaching for "the one in 'one or punishment'" (一か罰の一を追い求め). The song thus transforms a gambler's idiom into a meditation on perseverance under pressure. In maimai, 一か罰 debuted as a locked track in the ドラゴンちほー (Dragon Area), requiring players to accumulate 12 meters of area progress before it became playable. It was moved to general availability at the start of maimai でらっくす Splash (September 2020). The song's chart suite covers all five DX difficulties, with the three highest each assigned to a different notes designer: シチミヘルツ (Shichimi Hertz) on Expert, 華火職人 (Kanon Oguni) on Master, and サファ太 (Safata) on Re:MASTER, giving each upper-tier chart a distinct design identity. The Re:MASTER chart, added in maimai でらっくす BUDDiES (November 2023), sits at level 14.0 with 928 total notes and a notably high Break-note count of 108, delivering a climactic finish that mirrors the lyrical theme of chasing an uncertain prize.