Onee-sama to Watashi: Ojou-sama ga isekai Tensei

Hinako is reborn in a new world and refuses the powers given by the Goddess. Instead, she forms a sisterhood with the giant Eiris and adopts the name “the smallest giant.” Despite being different species from different worlds, Hinako and Eiris are united by their shared mission to find the siblings they lost. However, their growing bond and power attract the attention of church knights, forcing them to proceed with caution.