Shinobu and Alice sit outside observing the flowers when they happen to over hear Yoko speaking with Alice. Suddenly, Shino gets up and runs over to Yoko while addressing her using older sibling terms, until she snaps out of it and apologizes for her mistake. She then runs off in embarresement, then grabs onto their teacher while calling her Mom!
In class everyone claims that Shino made a simple mistake and that it isn't a big deal but this makes her feel no better. Yoko then tells Alice that she has known Shino since elementary school, and they were very close. Right after school had begun, Shino was so antisocial and nervous, trying to look for Isami and to make her feel better, Yoko took her to visit Isami. Who asks Yoko to look after Shinobu since she often-times worries she will get into trouble. She also gives Yoko a personal alarm for use in case anything happens.
Later on, Yoko was walking Shinobu home from school. She happens to be realizing what Isami said earlier and decided to protect her in place of Isami. It's then she notices they're being followed, but it turns out to just be Isami...
After finishing her story, Karen then says that she's like a big sister, then teases Aya by saying she's just an Aya.
When class ends, Shinobu asks Aya to help her study and reveals the zero she got on her test. She has Shino sit down and everyone watches as she explains there will be a make up test. So they begin to study the material and Aya scolds Shino for her use of "Fo' sho'". Shino admits that she thought it was for the test, and the other girls ask for Aya to help them study too. So she suggests they just have a study party.
Later on after school the girls meet up at Shino's place and are greeted by Isami. They explain why they have come, and Aya hands her a bag of items she got for all of them to share, while Karen asks for an autograph, claiming to have become a fan after seeing her in magazines.
In Shinobu's room, the girls are all studying together. Shino goes to ask them for some help, but then she goes to her sister to ask. Isami asks for something special from her sister first, but when Shino offers a mask she loves above all else, she turns it down.