SS-ST-1
Sakiko wakes up from a dream (of her life in RL), and talks about it with Vigna. Here, Sakiko is a Rhodes Island operator. Later, Sakiko and Vigna go on a field mission together, where they meet Iris and Bena from the Dream Castle. From Iris, Sakiko learns that they plan to use the Dream Castle's "beautiful dreams" to save Alice's pen pal.

SS-1 Before
After deciding to split up, Sakiko is the first to find the address of Iris' pen pal, An, and personally witnesses An's tragic life. In the final moments before An reaches adulthood, Sakiko plays a lullaby for her. As thanks, Iris gives Sakiko a necklace, but when Sakiko puts it on, she suddenly finds herself inside a massive castle.

SS-1 After
Aside from Sakiko, all the other members of Ave Mujica are trapped in dreams. Sakiko makes a bet with Morpheus, the "Master" of the Dream Castle, agreeing to venture into each member's dream to try and wake them up. However, the moment Sakiko enters Nyamu’s dream, she is overwhelmed by a flood of advertisements everywhere.

SS-2 Before
In Nyamu's dream, she has given up on being a drummer and instead joined Lungmen's entertainment industry. She trains hard in acting every day and rushes from one commercial event to another, but she doesn’t seem happy. Even the rare free time she manages to carve out gets filled with a variety show collaboration with Sora.

SS-2 After
On the show, Nyamu speaks insincere words just to please the audience. Meanwhile, as Sakiko tries to sneak into the filming site, she gets scammed by Morpheus, who is disguised as a ticket scalper. With Penguin Logistics chasing her all the way, Sakiko smashes through a window with Nyamu and escapes the venue.