It was originally published in Monthly Comic Blade on November 30th, 2010, and was later republished in Amanchu! Volume 4 on March 10th, 2012. In the original Monthly Comic Blade serialization, Chapter 22 was released as Chapter 21, but the chapter order was altered for the volume releases.
Ai Ninomiya is laying listlessly in her bed during summer vacation, unable to decide how to spend her free time and so doing nothing at all. She hears voices outside her window and goes onto her balcony where she sees Futaba Ooki and Hikari Kohinata outside her house who have come to see if she wants to go out shopping with them. Ai goes to harass her brother to come with them, but he rolls over and goes back to sleep even after she kicks him.
The three girls travel by bus and first visit stationary store to buy diving logbooks for Hikari and Futaba. They are initially indecisive because of all the choices on offer, but after finding log books that match Ai's (with clovers) they decide to get a matching set - Futaba's with hearts, and Hikari's with stars. The girls then pass by a swim wear store holding a sale and are tempted in. The girls have trouble deciding which swimwear sets to buy, but are having a lot of fun choosing and trying things on.
After they're done shopping, Hikari suggests they go to the beach, so the girls go to Amanchu-ya where they change into their new bathing suits and jump into the sea to swim and play. Ai reminisces about the fun day they've had and how it's mostly down to the fact that Hikari is impulsive and dives into whatever she decides. Hikari explains that she does have indecision sometimes, but that she enjoys it because the anticipation of deciding what fun thing to do next is fun in itself. Ai muses about how she's often frozen by her own indecision and that it means she misses out on so many chances to enjoy herself. She decides to be more like Hikari in future and not lose what she really seeks to do, which is to be herself.