Bright J-pop energy crashing straight into mahjong battle tension. Idol Janshi Suchie-Pai IV is a PS2 anime mahjong game and its soundtrack has no business going this hard. "Birthday★Energy" opens with full idol pop production, and then the actual gameplay tracks ramp up with post-riichi versions that add real urgency to tile matching.
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The character themes like "Theme of Mari" and "Theme of Kaoru" each have their own personality. Boss Battle 2 after riichi is genuinely intense for a mahjong game. Karaoke versions of the vocal tracks round it out. Peak mid-2000s PS2 anime game energy, completely unashamed of what it is.
If you ever wanted proof that mahjong games have better music than they deserve, here you go.