Sekai saikjó no madžucuši de aru šónen wa, maid kissa o džunbi suru (E10)

After the Magic Chevalier is over, the season turns to fall. While Ray and his class are getting excited about their plan for the cultural festival, they get word that Rebecca has been engaged to an upper-tier noble called Evan Bernstein. Ray goes to congratulate her, but gets the feeling that she is not her usual self. On top of that, Dina Sera asks Ray to watch over Rebecca, so he begins his investigation into Evan. However, the situation behind this way bigger than Ray could have imagined... (Crunchyroll)