The man Koharu loved wasn’t cheating on her…he was cheating on his wife with her! And not only that…he was the third guy in a row to do so. Dejected, she leaves Tokyo for her hometown, and rejects a future of love and marriage for a simpler life. But things have changed—her parents are struggling, the café they ran is closed, and a creepy man keeps following her around. She thinks this may be it for her, until she learns that her hometown has allowed polygamous marriage, and she’s in that man’s sights as his third wife!
Does it make you happy? To know you're woman number three? In the one city in Japan where polygamous marriage (AKA: Harem Marriage) is legal, Koharu is not only getting into the swing of her four-way marriage to Ryunosuke Date—she's relishing it, too! Stormy clouds appear on the horizon, though, when Koharu's dad inexplicably appears to revoke his blessing and orders his daughter to divorce her husband and two wives. That's when the Date family springs into action to prove to Daddy Maezono and the rest of the world that they're happy as can be in this Harem Marriage!