The Betrayed Diva

Having been bullied since his second year of middle school for one year, one day Tosoa is summoned to another world along with his entire class. The occupation he obtains there is "Song Priestess"—he has a large amount of magic power and high agility, but no one understands what kind of occupation it is, and he is treated as useless by those around him. There, he is betrayed by the king, his companions, and even the childhood friend he trusted, and is offered as a sacrifice to a sealed designated area of a dungeon. Despairing and thinking that everything was over...