Ep. 30: Minamo y sus amigas son despedidas por Sumire antes de que Moroboshi las invite a un espectáculo de fuegos artificiales casero

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At school, Minamo and the others confront Sumire, but are brushed off. Just as they're feeling down, Nagase's classmate, Main Moroboshi, approaches them and invites them to a fireworks display they've made themselves. (Source: Princession Orchestra Wiki)