Satoko Hojo kills Rika Furude multiple times in different timelines. Satoko's motive for killing Rika is a complex and tragic one. She deeply resents Rika for abandoning her and leaving her behind when they went to St. Lucia Academy. Satoko also wants to break free from the endless loop of time in which she and Rika are stuck and believes that the only way to do so is to make Rika suffer.

Satoko's actions are influenced by a mysterious being known as Lambdadelta, who is watching over Satoko and manipulating her emotions. Lambdadelta is a witch who is interested in Satoko's ability to manipulate time and is encouraging her to kill Rika.

Satoko's hatred towards Rika stems from a deeply rooted sense of abandonment and resentment. In their childhood, Satoko and Rika were best friends who were close and depended on each other. However, when they grew up and went to St. Lucia Academy, Rika found new friends and began to distance herself from Satoko. This made Satoko feel abandoned and replaced, causing her to develop a deep sense of anger and jealousy towards Rika and the only who can help is hanyuu.

And now Rika is being hunted in the classroom hall, all she can do is run and ask for help. While Satoko chases Rika madly, after several minutes she starts to get annoyed and finally pulls Rika's leg while Rika is falling down, before Satoko kicks Rika to face her while she is lying on the floor, before Satoko gets on top of Rika and grabs a knife

satoko hojo: "Oh..~ My dear love friend! You can't escape from me.. You let me follow your dreams and leave me behind like that?~.. Hanyu only helps you sometimes.. I WILL K-LL YOU SO THAT YOU CAN STAY WITH ME FOREVER AND FEEL MY TORTURE AND MY SUFFERING”