Agree with you, the vibe of chapter 133 and chapter 134 are not just differnt but opposite! LOL
The vibe of chapter 133 is that there’s still so much more of the story waiting to be revealed. Shinobu started his relationship with Fumi. Sakura had trouble with her career and missed Shinobu. Bla Bla Bla Even that Kodansha friend of mine thought Grapara would not end easily, it'd definitely have volume 15, which means about 14 chapters left.
But then chapter 134 twisted it (completely turned everything upside down). It abruptly cut off the relationship of both fucboy with Sakura (if the story continues for many chapters, there's no need to show fucboy's face because since the chapter 133 made us believe Sakura was single) and Shinobu with Fumi. The question is, how could they cut off the relationship between Shinobu and Fumi which just started in the previous chapter !? C'mon, isn't it extremely rushed ?
The vibe of chapter 134 is likely to push Shinobu and Sakura back together so the author, we suspect s/he is not Airi Katsura (sensei), eliminated the fucboy and Fumi out cruelly (I mean cruel for Fumi, not for fucboy who we hated. LOL).
And then, it was announced that there are only 2 chapters left ! So, there is no way for the misunderstanding to be resolved because a proper resolution would require at least 6-10 chapters to build the necessary situations for Shinobu and Sakura to meet and talk. With only 2 chapters remaining, it is difficult just to get them into the same room! Let alone have an actual conversation!
For me, it's weird, weird and weird. LOL
So, I also don't believe AK was the author of both chapter 133 and 134 unless she has bipolar disorder or has two opposite personalities. LOL