The infection has spread to every single day, clouding what is the most important to them. Radiant begins exhibiting strange behavior, especially toward the civilians. Albert is the Days Unions last hope to try and find a cure and Radiant is his test subject.
Operatives are only supposed to feel one emotion; the one they're assigned to. A familiar boy spends a month in the city with the others as one of the operatives realizes he's beginning to feel more emotions than they should.