Ohh more background information about past Shiori, I knew there was definitely something that only past Shiori knew as to why she acted like a bitch in the past, and current Shiori actually thought the same as well. That agreement they did with A-chan and Shi-chan on the past is intriguing. It was the first thing current Shiori actually remember from the past (those words from Akio) and probably holds quite a lot of value as with memory loss, the most memorable moments (bad or good) tends to be the ones that get's regained early.
From the looks of it she's unconsciously getting her memories back bit by bit, and there's signs that Kai and Shiori's relationship shaking if Shiori chooses to continue her work priorities over Kai, and it seems Akio has moved on from Mizuki as well which definitely set's the possibility as high.
Thanks for the chapter!