On the day of university registration, Lin Zhi'an was told by the System that he had to win over the protagonists of five small worlds.
Lin Zhi'an: "But I've never been in a relationship. I don't know how! What should I do?"
The System reassured him confidently: "Don't worry. I'm a fully mature System. I'll teach you everything, and you'll master it all."
After a few worlds, the System couldn't help crying out in alarm: "Oh no, I think I've bound myself to a natural-born incubus."
World One:
Taciturn senior sword cultivator x sunny, straightforward junior fellow disciple
World Two:
Sensitive, gentle cursed prince x mischievous black dragon
World Three:
Tsundere genius boy who can see ghosts x talkative ghost with no sense of boundaries
World Four:
Violent, bloodthirsty Demon Lord x little demon caught sneaking a bite who refuses to admit it
World Five:
Devout believer with a hidden dark side x god imprisoned without realizing it
The System told Lin Zhi'an that his targets were the five people who would enter the dormitory after him.
At first, Lin Zhi'an was happy that he could play games with his roommates.
After all, the System had said that once a roommate was successfully won over, their memories would be automatically erased and they would return to the dormitory.
But when he got back to the dormitory, he heard the System blare an alarm:
"Unknown malfunction detected. Data purge failed. Memories retained!"
The fourth and fifth people to enter the dormitory were two older boys from next door who had grown up with Lin Zhi'an.
Lin Zhi'an was delighted to see them, only to discover that neither of them recognized him.
The System said helplessly, "Their affection scores were already maxed out when they entered, so I had no choice but to erase their memories."
Lin Zhi'an: "?"
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(Open ending. It concludes with the chaotic love triangle after they return to the dormitory.)