It wasn’t stated explicitly in the raws but looking at it now, it looks like Yuki was referring to her talk with Akira about the class presidency incident back in grade school. She doesn’t remember what happens after it but has a flashback after Asaka points out the climbing poles.On pg. 16 when Yuuki mentions having a talk with Akira there, is she referring to the recent chapters or is it supposed to be another flashback?