[The current drafted content includes Type-Moon, Animal Crossing, JoJo, and more]
Rin: For the first time, I have someone I like. And I've finally made up with Sakura. These two happy things came together, and both joys should bring me countless more. I should have been enjoying this dreamlike happiness. So why did things end up like this...?
Sakura: It was me. I was first. It was all me first... Kissing him, hugging him, even falling for Senpai.
Shirou: I just want everyone to be happy!
Saber: How could such selfish happiness ever exist?!
[Female protagonist] [The protagonist is called Shinbashi Nayuta] [The protagonist does not appear often] [Spoiler-heavy] [Semi-invincible protagonist] [Original main world] [Feel like the title and synopsis describe two different books? That's right, they actually are two different books. Now watch, this is the ultimate fusion magic!!
The source material: "Miss Shinbashi Will Take Over the World" and "About How I Play a Game Starring Myself"
Fusion Summon!! Come forth! "Miss Shinbashi's Spoiler Game"!!]