BODY: There is something deeply satisfying about watching an army of King Slimes march down a conveyor belt. Rohto Pharmaceutical clearly thinks so too — the company has pulled back the curtain on how its upcoming "Rohto Z! King Slime" eye drops are made, posting footage of the production line to its official X account ahead of the June 10 release.
The product is a collaboration with the long-running Dragon Quest franchise, molding Rohto's eye drop bottle into the unmistakable crowned, stacked-slime silhouette of the King Slime — one of the series' most beloved enemy designs. The behind-the-scenes clips show the blue figures being filled, capped, and shipped out in bulk, a quietly mesmerizing parade of identical monarchs.
Rohto's "Z!" line is the company's high-stimulation range, known for its sharp, cooling sensation — a fitting match for a creature that is itself a fusion of eight ordinary slimes into one regal blob. The novelty bottle keeps the functional eye drop formula inside while turning a mundane pharmacy purchase into a collectible.
The eye drops go on sale nationwide June 10. Given Rohto's decision to tease the manufacturing run rather than just the packaging, the company is plainly betting that the "how it's made" angle drives as much social buzz as the product reveal itself.
The insider take
Rohto has leaned hard into character collaborations in recent years, but showing the factory floor is a savvy, very Japanese flex. Domestic audiences love a seizō katei (production process) reveal — it signals craftsmanship and authenticity, and it reliably goes viral on X. Pairing that with Dragon Quest, a property that occupies near-sacred status for Japanese gamers in their 30s and 40s, all but guarantees pharmacy shelves will be picked clean by collectors who have no intention of ever opening the bottle.
Originally reported by GAME Watch (Japanese).