Kanna no Kanna: Itan Shoukansha wa Scenario Breaker

A man named Kamishiro Kanna was summoned to a different world to serve as a hero, but the one who summoned him had ulterior motives. The princess, who had summoned him, intended to eliminate him after his mana level was found to be zero. While in the palace, Kanna met a half-elf girl with silver hair in the prison and together they fled on a dragon she had summoned. Unbeknownst to Kanna, three days after their escape, the princess performed another summoning, this time bringing in three high school students who were his close friends.