Aiai is from the idol group Shiritsu Ebisu Chuugaku (私立恵比寿中学).

Possibly sample pics from her second photobook which has the same theme, Aiai's love for trams and trains and similar things.

If there is any interest I can share her first photobook with scans and the video where Aiai goes to train/tram yards and so on. It was pretty entertaining actually