I wonder if we'll be given some insight into Mashiro's story beyond Fuuko's perspective - to see whether there's a reason she is the way she is, like we have with Fuuko, Yuni, and Nanase.
I guess Yuko's also an "active character" within the narrative that hasn't had a lot of fill-in, beyond knowing that she was possessive of Nanase in grade school and started those rumors to "chase off" the other girl and keep Nanase to herself. There doesn't necessarily need to be anything more than that for character motivation, but she and Mashiro are thus far the least fleshed-out, and are the two doing the most to the other three in general.
But - intriguing to get more of Fuuko's childhood here. Not much more than we knew before, but her relationship with her father is nonexistent, and the entirety of her relationships to this point seem...well, supremely unhealthy. Which, explains how she keeps getting drawn back to Mashiro--the one who would always call her cute and give her attention and affection, even if it was clearly manipulative and meant to "pull Fuuko in"--but she "lost" her onee-san; her familial relationships are fractured, strained, or seemingly outright shattered; and her relationship with Yuni is built on lies and pain and ulterior motives.
Which, Yuni was the "lens" character in that most of the story played out from her perspective - but it really seems like Fuuko might be the primary axis upon which this whole narrative spins. Her being the acting force on Yuni, while Mashiro is the acting force on her, coupled with how none of this story even happens without Fuuko reaching out to Yuni in the first place and bringing all five characters into orbit with one another, kinda puts Fuuko into the "locus" role, in my mind.
I'm interested to learn more about Mashiro from here, though. She also seemed like she might have feelings for her sensei, though there's not nearly enough there to actually take a stance one way or another. She's clearly groomed Fuuko, and is actively injuring her--and taking pleasure in it--even into the present as we can see with that kiss that she shows off at the end of this chapter.
Is Mashiro's own case a situation of cyclical grooming? Is she actually just a malicious character wholly acting without a "trigger", like Fuuko, Yuni, and Nanase are? She's also had her hooks in Fuuko for years; that speaks to something rather deep and impactful, because even if she's jerking around others (like her senpai here), she came back to Fuuko well after their last meeting, simply to pull her back in.
Abusers will do that with their victims, but it is also often about something of actual substance and not solely just "because I can/I like the control", so I'm wondering if that initial meeting at the library was a case of supreme bad luck on Fuuko's part, of if there'll be some narrative history that had Mashiro going after her specifically.
It twists deeper and deeper, though. Mashiro acting on Fuuko, Yuki acting on Nanase, and Yuni & Nanase acting on one another as their situation continues to deteriorate.
Thanks for the TL. Looking forward to the next.