[Aotu World/All Jin] I Lost My Memory and Fell into a Harem Battle

Full title: My Memory Loss Has Apparently Landed Me in a Love Triangle with My Childhood Friend and His Suitors

Warning: The author is planning to put everyone through the wringer.

Warning 2: The medical details are hastily made up and only briefly mentioned.

Background: Jin wakes up one day with no memories. He only remembers that his name is Jin and that he attends the high school division of AOTU Academy. His older sister is named Qiu and works overseas. And he has a childhood friend... Wait, who was it again?

Theme: If you end up in a love triangle, run!