Invasion

Invasion is one of two possible first episodes in Shiny Days.

Plot
It begins with a flashback to high school orientation, where Makoto Itou and Setsuna Kiyoura meet for the first time when he stops some bullies from picking on her. Setsuna then awakens, revealing the scene to have been a dream.

Meanwhile, Makoto is riding the train to school and sees Kotonoha Katsura for the first time, though they don't actually meet. Hikari Kuroda, also on the train, spots Makoto and berates him for "following" her and her friends onto the train. Meanwhile, Otome Katou is watching the exchange from the next car and receives a call from Inori Ashikaga.

All of the characters arrive at school to attend the exit ceremony for first semester, and their summer break begins.

Setsuna visits her best friend, Sekai Saionji, at her apartment, where the latter is sick in bed. Sekai asks Setsuna to fill in for her as a waitress at the Summer Radish while she's recovering. Setsuna refuses, and Sekai tries multiple tactics to convince her. Setsuna deflects them all but is caught off guard when Sekai mentions that the Radish is close to Makoto's apartment. Setsuna still refuses to take on the job, and Sekai playfully suggests that she might feverishly let slip Setsuna's feelings for Makoto to their friends. Setsuna finally relents, and Sekai reveals that her mother (and manager of the Radish), Youko Saionji, is already expecting her, as she knew she would be able to convince Setsuna. Makoto runs into Otome while walking to the beach. She asks him if he has any plans for the summer. He says he hasn't thought about it. They converse briefly, and he goes on his way, as she is busy with her family. Makoto then goes fishing, and then says aloud that he wants to have some fun this year like he used to earlier.

Setsuna arrives for her first day on the job and dons the Radish uniform. She immediately has reservations about it, thinking that it's too revealing; but Youko tells her it's cute. Setsuna then points out that she doesn't really fill out the uniform in the chest region. Youko offers her inserts, but Setsuna refuses.

As she begins her shift, Setsuna meets two of the other waitresses: Noan Murayama and Oruha Hashimoto. They ask if she's a relative of the manager, as positions at the Radish are highly sought after. After dealing with a handsy customer, she meets Kokoro Katsura, who asks for a refill on her orangeade, but Setsuna is slow to take the order. She then meets Moeko and Itaru Itou, who are having lunch. Moeko orders a parfait for Itaru, and Setsuna accidentally combines it with the orangeade. Itaru receives both items, and Kokoro never gets her refill. Noan then tells Setsuna to go outside and clean the terrace, which she does, albeit reluctantly.

Setsuna then meets Inori, who tries to hide from Karen Katou and the Nijou twins, Kazuha and Futaba. Once she's spotted by the three, Inori accidentally strips Setsuna, who winds up kicking her and knocking her out.

At the end of her shift, Setsuna is disheartened and ready to quit. As she's leaving, she thinks about how Makoto helped her at the entrance ceremony and what Sekai said about his apartment being nearby. As she's daydreaming and strolling along the boardwalk, she runs into Itaru, who recognizes her from the Radish as the waitress that brought her parfait. Itaru hugs her, and Makoto comes running to catch up to his sister. Setsuna and Makoto are shocked to see each other. They introduce themselves, and then the scene changes to Sekai's apartment.

Inori is admitted to the hospital by Youko. Inori then comes to live with Setsuna, as Sekai has the mumps. Setsuna then recalls her meeting with Makoto and smiles.