Rena is probably that girl from Jun's past lol.
I recognize that joke by Takamina, is it that one that she told everyone on AKBINGO? If it was then I watched it lol.
Yuu somehow has good timing lol, appearing when the girls are going to bully Acchan.
I like how Takamina and Haruna are so driven to be Acchan's friends, it's very kind xD.
Thanks for the update!