Lo mas seguro es que ambos hijos no sean de Fumiya. Chinami veia o sigue viendo al compañero asignado por el gobierno.
Espero estar equivocado en al menos uno, pero no creo.
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It's highly likely that neither of the children are Fumiya's. Chinami was seeing, or still is seeing, the partner assigned to her by the government.
I hope I'm wrong about at least one of them, but I doubt it.