Shimamura isn’t sure why Adachi suddenly ran away from her, but it looked to her like she had something to say but couldn’t say it. Unlike Adachi, who is increasingly obsessing over Shimamura in her inner thoughts, Shimamura is more introspective about herself, whether it’s the way she keeps “having regrets” or starting to “catch on to [her] lack of interest”.
Is Shimamura naturally just not interested in anything? Could Adachi be changing that part of her? When Adachi is absent for school and doesn’t answer her texts, Shimamura heads to her house. On the way, she meets the astronaut girl without the spacesuit, who thinks it’s “fate” that they keep meeting. Thankfully the spacegirl splits—I still honestly don’t know what her purpose is—and Shimamura’s unannounced visit is rewarded by seeing Adachi in her jammies.
Shimamura agrees to Adachi’s request to go out on Saturday—though Adachi’s original intent was to ask Shimamura to formally go out with her. Unfortunately the spacegirl is already with Shimamura when Adachi arrives, and proceeds to be a glittery blue-haired third wheel the whole time. Due to her little sister-ish size and demeanor, Shimamura can’t ignore the spacegirl’s attempts to grab her attention, which means Adachi gets less attention.
Moreover, the fact Shimamura so readily engages with the spacegirl makes it seem to Adachi that she’ll “take care” of anyone small and cute—including her—without thinking much of it. Adachi is thinking very much about Shimamura and Shimamura only, yet Shimamura is cognizant of everyone she spends time with.
That leads to a somewhat dark ending where she admits she allows “pieces” of herself to chip off in an attempt to keep herself “afloat”. These are the things she should be telling Adachi! I wish spacegirl would either explain her business with Shimamura or go away and give the main couple some space.