[Kihiru] Golden Night {Sling}

When Sara's three-month homestay with Yutaka's family ends in tearful goodbyes, the two reunite in America and fall in with a pair of genius twin scientists whose homemade remedies and mysterious lab equipment promise far more than a cure for strange-tasting water. Invited to the lab for a simple favor, Sara steps into a rumbling machine while Yutaka watches helplessly—and what emerges turns one eager girl into several identical copies, all with the same hungry smile aimed squarely at him. A sci-fi harem romp where cloning tech collides with first-time discoveries and every extra Sara means twice the trouble for one overwhelmed boy.