クラス転移したのにいきなり追放！？　～実は両想いだった巨乳美少女とイチャラブハーレムを作ります～ (Associated Names)

Ordinary high school boy, Yuya Kisaragi. One winter morning, while attending class as usual, the entire class is suddenly transferred from their classroom to a castle in another world. Moreover, Yuya is made an example of and is the only one who can’t return to his world. As he is cast out of the castle…