Please excuse me for the title's rough translation and my interpretation of the article.
Feel free to correct my translation!
The band held a press conference which included a surprise appearance by their (high) school teachers and friends then followed by a mini concert.
It was a revealing moment when they said that part of songs they currently cover (in the albums or concerts) included songs that reminded them of their childhood when growing up (like Secret Base or Hajimete no Chu).
Now it makes sense why they performed those songs
The best part of the news release are the pictures of the band
The girls looked great as it looks like they did Not wear much makeup especially Haruna
You want to hold Haruna in your arms after she cried (from Joy)!