Mahou x Shounen x Days!!!!!

Spreading love and hope to save the world—we are the Magic Sabers!! As candidates for the throne of the magical kingdom of Sefira, five slightly underachieving boys were sent out to train to become proper magicians. The mission given to them by the king is to act as the “Magic Sabers,” helping people in the human world. They cannot return to the kingdom until they are recognized as fully-fledged magicians!? To use magic, all five must transform together, and what's more, when they de-transform, they end up naked!? The chaotic magical life of five boys. (Source: Official site, translated)