If you guys actually notice Ai-chan is quite emotion to the ones that are graduating, and that she likes.
For example, take a look at Ai-chan performing Hare Ame Nochi Suki in Nacchi's graduation concert. This song was performed in the beginning of the concert and when she got to her solo part
kyou no namida wa shoppa sugiru wa
miraretakunai wa kono namida
she all of the sudden broke-up and started to feel like crying. We all know how Ai-chan likes Nacchi alot so from that we know she get very emotional when she sees the ones she likes are moving away.
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