Opia follows a love triangle set in a Victorian steampunk world. Soley is a young, regal woman madly in love with Kairn, a romantic young man and her husband-to-be. The two are set to marry; however, the arrival of Kairn's lover Ika creates tension between the two finances. Ika struggles to connect with Soley and longs to live within their estate as an equal part of their marriage. Soley and Ika confide in Kairn who offers little advice, and ultimately Soler's romantic advances toward Ika end in destruction. Once the wedding commences, it is apparent Ika has created a tear in Soley and Kairn's relationship. Will the three lovers be able to mend their bond?