Origin of the Best Void Magician

There were five students walking on the way to their own homes. Yet while walking they were flashed with blinding light and a magic cirlces surrounds them, lead them to another world. Is this the what so called Isekai?

Being summoned as hero, all five of them first to check their [Skill], ablessing from the goddess. And one of them, Kagerou Ibuki was granted [Void Magic].

But whats this? They gave him a scorned expressions towards him. What? [Void Magic] is useless? Due to that, he was kicked out of the castle. How he will survive with the so called useless [Skill]?