In the second week, they turned into yandere

Description

In the Tokyo love simulation game, Qing Shuijian, who traveled through time and became a supporting character, accidentally awakened the "Yellow Hair System", and fighting for love became his daily compulsory course.
After Niu walked away from the five female characters beside the male protagonist, he successfully passed the game for a week, but at the same time he gradually lost the most important emotion as a human being.
Two years later, he uninstalled the system and restarted the second program, hoping to return to a peaceful campus life and give the male protagonist a HE.
Unfortunately, it backfired.
The female characters he had been in contact with all turned into yanderes after their memories were erased.