Sato Saki is a contradictory person. She had a good hand, but she was miserable and had low self-esteem.
She is very changeable, whether it is her personality or her hobbies, she has only done one thing firmly in her life, which is to like Haihara Xiong.
She knew that Haihara Xiong did not like her, but she still selfishly chose to use magic to perform a death sacrifice at the end of her life, becoming Haihua Xiong's "protagonist halo".
Sato has deduced Haibara's future countless times early on. In 80% of the world lines, Haibara is dead. In 100% of the world lines, he did not fall in love with her. Therefore, Haibara will not be too sad if she sacrifices her.
In Sato's eyes, the world seems to be a royal hot-blooded drama. As the protagonist, Haibara heals and saves the supporting character who has inferiority and paranoia. It is natural that the supporting character will also devote his life to the protagonist, so the sacrifice is reasonable.
Nanami Kento saw Sato Saki's inner paranoia very early on, but he did not expect that she would become so crazy, which would completely change Haibara's life trajectory.
Haihara Yu was too slow, and his love only began when Sato passed away early.
Motto: It doesn't matter if you are mentally ill, there will always be someone who loves you