So I Accidentally Got A Harem Because of The Law, What Now?

[AU] "Strategic Polygamy Bill." In a desperate attempt to quell the declining birthrate, Japan has implemented a controversial law, causing one Hikigaya Hachiman to despair at the destruction of his househusband dreams. What he didn't know, however, was that his dreams only got ever closer to fruition. This time whether he liked it or not.