Call for All, Summon Kadoya Saya at the Beginning

This is a terrible world where monsters are rampant and 70% of humanity has been wiped out. In this world, thermal weapons have withdrawn from the stage of history. When everyone graduates from high school, they must perform a summoning ceremony to summon powerful creatures from other dimensions. **, Elves, weirdos, spirits, and even dimensional characters! Jiang Teng traveled back to himself who was about to graduate, and during the summoning ceremony, he summoned an unexpected character. A girl with sexual abilities, Kadoya Shi's younger sister, Kadoya Saya! After completing the life link contract, Kadoya Saya handed the belt entrusted to him by her brother to Jiang Teng. And that belt turned out to be the Dark Emperor Cavalry Belt! Jiang Teng's Kamen Rider legend begins here! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.