My Sister and Giant: A Young Lady is Reborn in Another World.

Hinako, a girl who came from another world, made a vow of sisterhood with a giant called Elis, and together they became known as 'The Smallest Giants'. They both have goals that aligned in tracking down people who were significant to them. For Hinako, it is her 'Onee-sama' who was also transported to this world, and for Elis it's the kin she was separated from. However, when collecting their reward after fulfilling a request at the guild, Hinako caught the eye of a knight who serves the church...