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This is my first time seeing this manga. The name is Asagiiro no WHAT? The random Portuguese got me surprised.
For those who don't know, "saudade" is the Portuguese word for the emotion of missing someone or something, something similar to nostalgia but not quite.
In chapter 1, Ren's internal monologue says Matsuri is the person she had been "dying to meet", so I guess that feeling was "saudade"