Re:ZERO -Starting Life in Another World- Memory Snow

Subaru and his comrades defeat Wolgarms once and for all, saving the children of Irlam. The heroes briefly enjoy peace until Subaru begins to prepare a top-secret mission of his own. However, Subaru's disguise does not fool Petra and the villagers. What is Subaru's secret mission about? Practicing for his date with Emilia!