Endless Tales: Beginning in Type-moon

Thanks for the invitation. I'm in Fuyuki, known as "Second Master." The Fourth Holy Grail War just ended, and Second Uncle just passed away... the timing is perfect. Right after the Fourth Holy Grail War, a boy named Matou Shinji begins to awaken his memories from before his reincarnation. He still remembers a joke he read online in his previous life: What's the first thing to do after transmigrating to Fuyuki City? Kill the bugs and save Sakura! Shinji looks at himself in the mirror... Hmm, time to wash up and go to bed. Ding! [Your system is online!] Sakura! Onii-chan is here to save you! ...Wait, something's not right. Why does this system sound so much like Siri?