BODY: If you want a blue, crowned blob of Dragon Quest royalty sitting on your desk dispensing menthol into your eyeballs, the clock is running out. Rohto Pharmaceutical's made-to-order window for its King Slime collaboration eye drops closes at 8pm JST tonight, October 1.
Two products are on offer: Rohto Z!b King Slime Eye Drops (a Class 2 OTC medicine) and Rohto Z! Contact b King Slime Eye Drops (Class 3, formulated for contact lens wearers). Both are real, regulated pharmaceuticals, not novelty goods — the bottle just happens to be shaped like the monster that appears when eight slimes fuse together.
This is the third entry in the ongoing Rohto Z! × Dragon Quest series, timed to the franchise's 40th anniversary. The King Slime bottles first went on sale in limited quantities on June 10, 2026, and sold well enough that Rohto reopened the line as a limited-period, order-only run. Buyers need a Rohto Pharmaceutical Online account to place an order, and shipping is scheduled to begin in waves from late March 2027 — roughly six months of waiting for a bottle of eye drops.
Rohto leaned into the collaboration earlier this year by publicly showing off the production line, with footage of King Slime bottles rolling off the factory floor in bulk. It's an unusually transparent flex for a pharmaceutical company, and a sign of how seriously the Z! brand is treating its game-industry crossovers.
The insider take
Japanese consumers are used to the juchū hanbai model — take orders first, manufacture second — because it lets companies avoid dead stock, but it's rarer to see it applied to medicine, where batch dates and expiry windows constrain everything. That six-month lead time isn't corporate foot-dragging; it's a pharmaceutical production schedule. The Rohto Z! line, meanwhile, is legendary in Japan for its brutal cooling sting, sold on the premise that the eye drops should hurt a little to prove they're working. Pairing that masochistic salaryman staple with Dragon Quest — the franchise your father played — is a very precise piece of nostalgia targeting.
Originally reported by GAME Watch (Japanese).