Magical tools masters normally can't use magical tools, but Roji realizes that Rio used one to protect Bico. Meanwhile, Muhyo has collapsed after exhausting his ren, leaving him in a dangerous condition of mental numbness... the exact moment Rio has been waiting for.
Beelzebub's Treasure Chest
صندوق كنز بعلزبول
Die Schatztruhe des Moskitokönigs
Cofre de Tesoro de Belcebú
LE COFFRE DU
SEIGNEUR DES MOUCHES
Lo scrigno del tesoro 
di Belzebù
Baú do Tesouro do Belzebu
Сундук сокровищ Вельзевула