[ACertainStark]

spoilers are tld:

Spoiler:

Mitori becomes friends with Dolly, but eventually learns the truth about her.
She tells the researchers to stop the experiment, but they lock her up instead.
A few months later, the research institution is empty, so she escapes and vows to exact revenge against the board of directors.
Her carefully prepared assassination plan fails and she is brought to Gensei who decides to use her hatred for his plan.

In the present, Misaki appears before Mitori and tells her to come with her.
She says she read Gensei's mind and learned of a sister of Dolly's created at the same time.
Dolly had also been used to test the creation of an information sharing network between clones, so Dolly's memories and experiences had been transferred to the sister.
That sister is not Dolly herself, but Misaki says she can't just ignore her.
Mitori asks why Misaki isn't just using Mental Out to get her help.
Misaki asks if she needs to and Mitori says no.