: The protagonist, Aki, is a complex character whose inner world is extensively explored throughout the series. Her interactions and thoughts provide insight into her development and the overarching themes of the story.

: The series heavily incorporates themes of nostalgia and longing, not just for places or times but also for connections with others. Characters often find themselves reminiscing about past experiences and expressing desires for something more, whether that's a deeper connection with someone or a different life path.