Vaccination: Become ABO, Mary Sue's mindless and stupid article
Because the original world was about to be destroyed, the male protagonist traveled to the world of ABO at the request of the doctor to look for the bone eye. Who would have thought that he would become O. On the way of searching, I met a group of like-minded friends, including him... After all the hard work, he finally found the bone eye in the deepest part of Longyanpan Cave in Kunshan... If you want to know what happened next, please stay tuned.
Purpose: Save the world