I was summoned to another world. As a hero, I promised to spend my life with my party members: a mage, an elf, a saint, and a princess swordsman. However, they tried to kill me after I defeated the Demon King.
The Demon King offered to take revenge, but I refused and returned to Earth.
And they chased after me,
saying they were sorry for not trusting me.
You are the only one I can trust, older sister.
[This is an incestuous pure love story with an older sister.]