After a holiday, cruel reality is the destiny that awaits... Even in another world, that doesn't change. Mile and the others are worried about Pauline who has suddenly disappeared. Then Mavis receives a letter from home saying that her older brother is getting married, and his bride to be is none other than Pauline!?
In order to settle the debts of Pauline's past and deal with Mavis' family situation, Mile and the others head to Pauline's home town!
They just have to not know 
we're the Crimson Vow, right?
كلّ ما عليهم هو ألّا يعلموا بأننا العهد
القرمزي، صحيح؟
Sie dürfen nur nicht wissen,
dass wir Blutroter Eid sind, oder?
Basta che non sappiano che
siamo del Giuramento Cremisi, no?
Basta não saberem que somos
do Voto Carmesim, certo?
Главное, чтобы нас 
не опознали как «Алую клятву»?