| Plot
| - thumb|left|Mugi sneaks up on Ritsu.
It's the day before the start of the summer classes. Ritsu calls Mio, hoping to hang out, but Mio declines, as she's busy studying. Since Yui and Nodoka are also studying together, Ritsu is left alone at the train station with nothing to do. However, she spots Tsumugi disappear around a corner. Thinking she hasn't been spotted, Ritsu tries to sneak up on Mugi, only to be surprised herself when Mugi ambushes her.
Although Mugi only intended to do some shopping, she enthusiastically agrees to hang out with Ritsu for the day. Mugi, who is just simply excited to be out together with Ritsu for the first time, lets Ritsu decide where to go. Ritsu thinks it would be interesting to take Mugi to places she normally wouldn't go, suggesting an arcade first. To Ritsu, Mugi seems to disapprove of this choice, but Mugi quickly reaffirms her eagerness, by recalling how their last trip to the arcade with the whole club was so much fun.
thumb|right|Mugi tries to win a teddy bear at a claw machine.
At the arcade, Mugi is completely enthralled by the novelty of many of the games there. With so much choice, Mugi is unable to stay calm, and excitedly points out an arm wrestling game to try first. Whereas Ritsu struggled against the game and lost, Mugi avenged Ritsu with a swift, overpowering swing. At a claw crane, Mugi is devastated when she fails to get the teddy bear she wanted, but with a bit of finesse and luck, Ritsu wins it for her. Secretly, Ritsu is glad that they didn't end up empty handed, lest she endure Mugi's disappointment for the rest of the day. Finally, they go into a photo booth, striking goofy poses and messing up each other's appearances in the photos.
thumb|left|Mugi stuffs candy into her mouth.
Having realized that they spent quite a bit of money at the arcade, Ritsu takes an ever ecstatic Mugi to a dagashiya. Like in the arcade, Mugi is overjoyed as she explores the store, pointing out all sorts of treats which she can't believe only cost about 20 or 30 yen. After shopping, Ritsu shows Mugi her personal tricks and ways of eating the candy.
thumb|right|Ritsu can't do a full force chop.
Over lunch at a fast food restaurant, Mugi praises Ritsu for having gotten so much out of the day on not a lot of money. However, Ritsu knows that by normal standards, they spent quite a bit. She recalls the time Mio hit her for trying to mooch too much money at the music store. This anecdote turns Mugi unusually sullen, who explains to Ritsu that there's been something she's been looking forward to for a long time. Feeling like she's missing out on physical intimacy that the rest of the club experiences, like Mio hitting Ritsu, or Yui doting on Azusa, Mugi makes a sincere request of Ritsu to hit her. But Ritsu can't bring herself to do it -- not unless she has a specific reason to do so, like if Mugi does something incredibly stupid.
thumb|left|Yui and Ritsu replace Mugi's eyebrows with protractors.
Meanwhile, Yui is studying with Nodoka, but falls asleep and has a dream about Mugi's eyebrows being takuan slices. Yui and Ritsu pluck both of Mugi's eyebrows - and they're delicious. However, what they didn't know is that when both of Mugi's eyebrows are removed, she deflates into a blob. Desperate to find replacements, they use protractors as substitute eyebrows. Yui and Nodoka later take a break from studying with some cake. Yui, wishing to try some of Nodoka's cake, offers to trade a bite. Though she agrees, Nodoka feels guilty about trying Yui's more expensive cake, so she only takes the strawberry, without realizing that this breaks Yui's social expectations of cake-sharing etiquette. Yui frantically calls Azusa, desperately trying to find someone who agrees with her that it's wrong to take the strawberry off the top of the cake. Neither Nodoka nor Azusa seem to understand Yui's hysteria.
125px|right|Mugi's beach dress.
The next day, summer classes begin. Mio has accidentally worn her school uniform, despite there being no requirement to do so, and Ritsu takes the opportunity to merciless tease her for it. Mugi, however, turns up in a totally inappropriate outfit. Not only does she wear a dress more suited to a beach than a classroom, she also wears socks with her sandals. Ritsu catches onto Mugi's plan - to try to coax someone into hitting her by acting as stupidly as she can. On the way up to the classroom, Yui tries to explain her cake dilemma to Mio, who completely understands, having hit Ritsu before for the same reason. Mugi takes special notice of this last part.
thumb|left|Mugi and Ritsu wear goofy glasses.
Ritsu confronts Mugi about her plan and agrees to help, so long as Mugi act as outlandishly as possible, without fear of embarrassment. Firstly, they try to annoy Mio by wearing novelty glasses, but the ones Mugi chooses actually look good on her. Next, Ritsu tells Yui to squint her eyes while reading her study guide so that the answer will pop out. Mugi does the same, but is praised by Mio when she gets the correct answer. Finally, they show Mio their student cards. Ritsu has the back of her head to the camera in her picture, and Mugi has a pig nose, but Mio realizes that Mugi's is just a sticker covering up a far more normal picture. Despite trying her best, Mugi couldn't get Mio to hit her.
thumb|right|Mugi steals Mio's strawberry.
The day after, at the club room, there's an extra slice of cake. The club play a game to decide who will get the extra slice, and Ritsu takes the chance to suggest that the loser will get flicked, hoping that Mugi will intentionally lose. Ironically, Mugi wins the extra slice, and Ritsu gets her forehead flicked. When they sit down to eat, Mugi realizes that it's strawberry cake, and seizes the opportunity to steal Mio's strawberry just before she eats it herself. Not knowing what to make of the situation, Mio simply cries, and Yui finally gets to prove to Nodoka the importance of the strawberry.
thumb|left|Mugi and Ritsu showing off their band-aids.
Mugi finally explains herself, apologizing for her selfishness. Mio reluctantly agrees to, but just can't bring herself to do it, and hits Ritsu instead. Leaving the school together, Ritsu laments to Mugi that they failed, but Mugi doesn't mind anymore. Mugi confesses that she really appreciates Ritsu as a friend who is kind and determined, finally stating that were she a boy, Ritsu would be really popular. Confused, embarrassed, and unsure of how to react, Ritsu hits Mugi.
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