Combat begins after Restina's father "convinces" Yuuto to take up Motome and become their Etranger. At first you use Aseria, Esperia and Orpha, but Yuuto comes in after an event. I'm pretty sure that Esperia explains how the system works in Eien no Aseria, just like how Rehme and Satsuki-senpai explains the system in Seinarukana
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