Weird placement for an extra. Unless these two are going to be put into the main story, why not just make a new one shot story page with this? I know it's just two pages, however this extra seems out of place for this manga even if the senpai cameos in the first page of this chapter.
Also the extra story is kind of weird; a girl likes her senpai so much that the girl is happy when senpai gets rejected/heartbroken by senpai's crush. Also the senpai is creeped out by the girl's eyes and doesn't want to hang out with the girl. Not really a romance for the ages. The author finally does a yuri romance (from what I gathered from the other comments here) and this is what we get? Perhaps it could get actual development if it was serialized, however I doubt that a concept oneshot from over two years ago (from what I've seen from the comments) will get the serialized treatment anytime soon.
Let's just focus on the awkward romance we been reading for the past 29 chapters, okay?