In the second week, they became yandere

In the Tokyo love simulation game, Shimizu Jian, who traveled through time and space to become a supporting character, accidentally awakened the "Yellow Hair System", and stealing someone's love became his daily compulsory course.
After Niu Zou killed the five female characters around the male protagonist, he successfully completed the first round of the game, but at the same time he gradually lost the most important emotions as a human being.
Two years later, he uninstalled the system and restarted the second round, wanting to return to a peaceful campus life and give the male protagonist a happy ending.
Unfortunately, it backfired.
All the female characters he had come into contact with turned into yanderes after their memories were erased.