Summer Pockets follows a branching plot line with multiple endings, and depending on the decisions that the player makes during the game, the plot will progress in a specific direction. When the game is completed at least once, a gallery of the viewed CGs and played background music becomes available on the game's title screen.

Throughout the game, the player encounters CG artwork at certain points in the story, which take the place of the background art and character sprites. The text in the game is accompanied by character sprites, which represent who Hairi is talking to, over background art. Much of its gameplay is spent on reading the story's narrative and dialogue. Summer Pockets is a romance visual novel in which the player assumes the role of Hairi Takahara. Nostalgia and the maternal bond are prominent themes in the game. Although Air also features a rural, seaside setting during the summer, the development team aimed for Summer Pockets to have a different feeling to it. The game's concept is by Jun Maeda, but he did not write the scenario due to similarities in themes with Air, which he primarily wrote. The gameplay in Summer Pockets follows an interactive branching plot line with multiple scenarios, and focuses on the player character gaining the favor of the four female main characters this is expanded to seven in Reflection Blue. Once there, he gets to know the townsfolk of Torishirojima and multiple girls who are the focus of the story.

The story is set on a fictional island on the Seto Inland Sea and follows the life of Hairi Takahara, a young man who uses the recent death of his grandmother as an excuse to escape to the island after an unpleasant incident. An English version of the original game for Windows was released by Visual Arts in 2020. Reflection Blue has also additionally been ported to the PlayStation 4. Both the original game and Reflection Blue have been ported to iOS and Android devices, and the Nintendo Switch. An expanded version of the game titled Summer Pockets Reflection Blue was released on Jin Japan. Summer Pockets is Key's 13th game, following its previous games such as Kanon, Air, and Clannad. It was released on Jfor Windows and is rated for all ages. Summer Pockets is a Japanese visual novel developed by Key, a brand of Visual Arts.

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