By volume four, the Mitrasphere composers are clearly having fun with seasonal events while still delivering on the combat front. "Grand Battle Rush" escalates the series' already strong battle formula with tighter pacing.
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"Extra Battle II" hits with a finality that earns its subtitle. The anniversary tracks have this celebratory confidence, like the team knows what they've built. "合戦場" across its three time-of-day variants (morning, day, night) is a great atmospheric trick, same battlefield shifting in mood as the light changes.
"物ノ怪ハロウィン" leans into theatrical horror. "勝負あり!熱々料理大決戦!" is... a cooking battle theme, and it goes harder than it has any right to. Completionists who followed the first three volumes need this.