Multiverse Time Loop: I Do As I Please

High school student Fushimi Makoto is a transmigrator. Not only has he transmigrated into a multiverse world, but he's also trapped in a time loop.

He has lived the same day for an unknown number of years. Yukino Yukinoshita, Kasumigaoka Utaha, the Nakano quintuplets... he has tried to conquer every anime girl he could using the time loop.

Just as he was starting to feel annoyed and numb, the time loop suddenly ended, and a system arrived.

Intern System 4399 reporting, finally found you, my host.

Detected temporal anomaly, this is bad. Host, how have you spent decades in this world?

System mission has been forcibly updated. Looks like this intern system can't graduate now, sad.

Fushimi Makoto: "Don't panic, I have a plan. Since things are already like this, I'll help you complete your internship, and you help me reap the rewards. It's a win-win."

System: "Please elaborate."

System Mission Issued: Detected that the host already knows Yukino Yukinoshita. Given that you've lived for decades longer than others, please become her favorite elder.

Fushimi Makoto: "Simple, I'll handle Mrs. Yukinoshita."

System: "?"

(The protagonist is a proactive carnivore. Do not spray if you dislike it.)