Together with Sister/Summary

Shinobu and Alice sit outside observing the flowers when they happen to overhear Yoko speaking. Shino gets up and runs over to Yoko while addressing her using older sibling terms. She snaps out of it and apologizes for her mistake, then runs off in embarrassment. Only to grab onto their teacher and call her Mom.

In class the girls try to make Shino feel better by saying she made a simple mistake and it isn't a big deal. Yoko then mentions knowing Shino since elementary school; she was very antisocial and nervous and always tried to look for Isami to make her feel better. One day, Yoko took Shino to go and visit Isami, who asked her to watch over Shino since she often worries about her. She gave Yoko a personal alarm for use in case anything would happen. 

Later on, in that day, Yoko walked Shino home from school. She had realized what Isami said earlier and decides that she will protect her in place of Isami. It's then she happens to realize they are being followed - but it was just Isami. After the story concludes, Karen mentions that Yoko is like a big sister. Then she teases Aya by saying she is 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.

After school the girls meet up at Shino's and are greeted by Isami. They explain why they have shown up like this and Aya hands her a large bag of items for all of them to share. Karen asks for an autograph meanwhile, and claims to be a fan of Isami after seeing her in the magazines.

In Shino's room the girls study. Shino asks for some help, but then she goes to ask her sister instead. Isami asks for something special from her sister first, but turns down the mask Shino loves above all else.

Eventually the girls stop for a lunch break and they comment on how Aya would make a good wife, after it turns out she made the food they're snacking on. Yoko tries to lay and say it's good after she tries a bite, but then she watches as Alice and Karen flat out tell her it lacks flavor; causing her to react with a bit of surprise by how blunt they were.

After everyone finishes, Karen sneaks into Isami's room and happens to spot her neat camera. Just as she approaches it, the older girl returns and finds her, causing her to panic until Isami claims it to be fine. She grabs her camera and returns to the others with Karen, and tells them that while she likes to have her picture taken, she enjoys taking them more. So she asks the girls to pose for her, but this proves a little difficult and they decide to go out to the park for better pictures.

While there, she comments on how grown up Shino has become and the girls sit down. Isami tells Karen to start posing and Karen is sure she will do well - since she practices posing before a mirror every day. Isami tells her to act more natural though, and Yoko asks to get a picture of Isami and Aya. After several changes, they finally get the pictures they desired.

Later on the girls prepare to leave. They ask that Isami shows their pictures to the people she works with and she teases them by saying she isn't very sure.

The following day, Isami is showing a friend one of the pictures she took. The friend asks what it is like having Alice live with them and she compares it to having two cute little sisters. She then takes a moment to discuss how much she worries over Shino, due to her absent-minded nature. Lately she finds herself worrying less and less though, because she has finally become passionate about something, but even now she worries over her future. 

In class 1-B, Aya comes by Yoko and brings up her lack of dressing properly for class. Yoko claims that she will for important ceremonies and events though, but Aya insists that she dresses right, and now, and tries to fix her outfit. Yoko gains some mature compliments after, but this makes her wonder what she is normally thought of.

Later, after Alice and Karen come by, they struggle to recognize the sudden change in appearance. With that the girls decide to do some arm wrestling. Alice has a lot of difficulty and Yoko decides to let her win. Alice is highly confident now, and claims that she can probably take on a bear, frustrating Yoko. She decides to give her a few fighting pointers then, to make sure she doesn't do something stupid.

Karen carries a heavy stack of books when Yoko comes by and offers to lend a hand. But Karen refuses, because she wants Yoko to carry her AND the books. When they arrive to class, Karen points out that Yoko is very reassuring and compares her to a convenience store. 

Yoko finds Shino troubled over something. She explains that Isami almost threw away the papers that she saved from an overseas trip. Then Yoko overhears Aya coughing and mentions a slight cold she gained. As Yoko makes an attempt to touch her forehead, she gets smacked by Aya - so she gives her a facial mask to wear. This causes Karen to continue to pretend she is a convenience store.

Frustrated, Yoko asks what the others think about her. Shino suggests they make a pie chart and they find that it is a single piece labeled "Comedic Retorts".

Yoko catches Karen staring at her and asks what she's doing. Karen has been working on a brand new pie chart and hangs it up, along with the one Shino made. The only real difference is that the pie was cut in half; with half saying "kindness". This flatters Yoko and Karen reveals the two-sliced chart she made for Aya, also. One is labeled intelligence and shyness, while the last section is for Yoko. Aya is beyond angry and she destroys the chart as Yoko asks if she may have a fever. Aya rips off the face mask and storms off.

The girls resume discussing regarding Shino's slip up from earlier. They are all single children, compared to her, and they claim that they wish to have an older sister like her.

Later on in class, Shino asks their teacher if she has any siblings. She reveals that she is the youngest of three, and she has two older brothers she adores dearly and still addresses with childish terms.

After class Yoko joins Shino. She comments on how Shino doesn't get so sidetracked anymore and she walks off, claiming that Shino doesn't need her. The same thing happens when Aya approaches Yoko and admits to being sad, because Shino isn't dependent on her. Then they claim that Shino would be fine no matter what might happen to her, but Yoko points out that their examples and theories are a bit far-fetched, so they make little to no sense. The girls recall a moment when Yoko was younger and she asked Isami if she could call her "Isa-nee", since she felt like an older sister to her.

Later on Shinbou takes Alice to where her sister was originally scouted. They decide to sit by for a while, to see if the same thing happens to them. But nothing happens and they are found by Aya, who mentions that she thought they already left.