Rumors have started spreading around school about Minatsu being a robot, and some people even have the nerve to directly approach her and Yume about it. This is what Yume had told Yoshiyuki about during the earlier phone call, and it’s what he worries about on his trip instead of paying attention to Koko. At one point, a boy even touches Minatsu’s hand just to see if it’s human-like, but fortunately Mayuki and Otome arrive to break things up. Mayuki feels that they can’t ignore this and should get to the bottom of it, but Otome wants to wait on that because she secretly already knows the truth. However, Mayuki argues that not doing something would be worse for Minatsu, and when she questions if Otome knows something, Otome doesn’t answer her. A student then rushes in with news of trouble, but Otome never gets to respond because she faints as soon as she tries to stand up. The last image in her head before losing consciousness is that of Yoshiyuki leaving for his trip.
When Yoshiyuki finds out about this from Yume, he decides to head home immediately. The others in his class, including Koko, end up hearing about it from Wataru, but Wataru doesn’t know why Yoshiyuki left. Otome meanwhile has a dream of a promise she made with Yoshiyuki under the sakura tree many years ago about keeping their magic a secret between just the two of them. She had felt that sharing a secret would make them one in body and mind even though she wasn’t entirely sure what that meant, and the two had pink-swore on it. Otome now wakes up to find Yoshiyuki watching over her from her bedside and apologizes for making him come back early from his trip. She claims that she’s fine now and mentions that he remembered the promise, but since he doesn’t seem immediately seem to recall what she’s talking about, she says that it’s nothing. In standing up to get her some soup, Yoshiyuki briefly feels dizzy and has to hold the windowsill to keep his balance. He claims that it was just from standing up too fast, but that doesn’t keep Otome from worrying about him.
At school, the robot talk continues, and Mizukoshi tells Yoshiyuki that revealing Minatsu’s true identity would only fan the flames. She points out that everyone wouldn’t accept Minatsu the same way that him and his friends have and notes that there are some people who even hate them. Sakura then comes into the infirmary and asks Yoshiyuki to leave deciding what to do up to her and Mizukoshi. She also thanks him and welcomes him back, taking off the pendant she gave him before he left. At home, Yoshiyuki finds Otome up and moving again, and she apologizes to him again about cutting short his school trip. Her mention of Koko reminds Yoshiyuki of the promise he broke, and he rushes back to school to meet with Koko right as she’s arriving back from the trip. He follows her back home and tries to ask her how the trip was, but when she responds with silence, he apologizes and reveals that he had something urgent to do.
Koko, however, questions why he went home without saying anything to her. Yoshiyuki tries to explain that it couldn’t be helped because of what’s going on with his sister and Minatsu, but Koko already understood all that and wanted him at least to say something to her before he left – she would have been fine if he had just said one sentence to her. Wiping away the tears, Koko points out their shadows aren’t overlapping before running home by herself. The next day, she treats Yoshiyuki distantly, and she goes out of her way not to interact with him when Suginami shows the group the pictures he took during the trip. Yoshiyuki eventually heads to the rooftop to think about this, and he remembers how he and Koko had fought and made up when they were kids. His thoughts are interrupted when Maya shows up on the rooftop to ask him about Minatsu being a robot. He calls it a silly rumor, but she keeps pressing him for the truth about if Minatsu is a Mu.
Speaking hypothetically, Yoshiyuki asks what Maya would do if that were true. She tells him that she’d request the proper measures to get Minatsu kicked out of school because she feels that robots and humans working together is outrageous. Yoshiyuki tries to protest that Minatsu hasn’t done anything bad, but Maya points out that they don’t know what robots can bring about. She figures out that Yoshiyuki standing up for Minatsu amounts to an admission that Minatsu is indeed a robot, and she vows to report it to the student council. Frustrated, Yoshiyuki goes to see Mizukoshi again with Minatsu, and he rejects Minatsu’s notion that it’s impossible for humans and robots to get along together. On the topic of Maya, Mizukoshi reveals that Maya’s father was the robot engineer who developed the Mu hoping to make people’s lives better, but the public instead felt inferior to the robots. They blamed Maya’s father for everything, and feeling cornered, he took his own life. Maya in turn blames robots for leaving her without a father. Learning all of this has left Yoshiyuki shocked and speechless.
All of the sudden I’m a little overwhelmed by everything happening in the story since now we have no less than three things all going on (Koko mad at Yoshiyuki, Otome’s fainting and her memories of the promise, and all the robot stuff). They were taking things so slowly for the past nine episodes and then bang, everything came out at once. The pacing could have used some tweaking, particularly when it seems like Minatsu’s story could have been taken care of earlier. Having said that, I do like that things are finally getting really interesting, and if the three plot threads are truly intertwined, then it’ll all (hopefully) make sense in the coming episodes.