ROHTO Zi ® Slime eye drops are now King Slime eye drops! The third installment of this popular collaboration eye drop series is available in limited quantities!

Products/Business

To commemorate the 40th anniversary of "Dragon Quest," "ROHTO Zi ®" makes a "critical hit!" ROHTO Zi ® Slime eye drops are now King Slime eye drops! The third installment of the popular collaboration eye drops will be released in limited quantities!

May 27, 2026

ROHTO Pharmaceutical Co., Ltd. (Headquarters: Osaka City, President: Hidetoshi Segi) will sequentially release "ROHTO Zi Slime-shaped Eye Drops," a limited-edition product created in collaboration with "Dragon Quest," a hugely popular game series loved by generations around the world, at drugstores and e-commerce sites nationwide starting June 10, 2026 (Wednesday). In 2017, the first collaboration with "Dragon Quest," which was celebrating its 30th anniversary at the time, resulted in the release of eye drops in a slime-shaped container, which was met with great enthusiasm. For this third collaboration, a special edition bottle in the shape of the popular monster "King Slime" has been adopted. To commemorate the 40th anniversary of "Dragon Quest," we will propose making daily eye care more enjoyable and positive with the refreshing feeling of "ROHTO Zi "
Please note that the start date for availability in stores may vary depending on distribution conditions.

In-store promotional material image

Background of the collaboration

Modern life is inseparable from "screen time," whether it's smartphones, computers, or game consoles. While convenience and enjoyment are spreading, our eyes are becoming increasingly strained without us even realizing it.
That's why we believe that eye care is no longer just for a select few, but a form of self-care that is accessible to everyone. Since its launch in 1987, ROHTO Zi Z has been a brand supported by many customers for its reliable effectiveness and refreshing sensation. This collaboration combines the 40-year history of adventure that Dragon Quest has accumulated with the history of refreshing tired eyes that ROHTO Zi Z has walked through, which will celebrate its 40th anniversary next year. Using the beloved King Slime as a starting point, we will propose the value of eye care that is close to the daily lives of consumers.

Product overview

  1. A new, large-capacity eye drop that faithfully recreates King Slime!

    "!? The slime eye drops... ... ..." The slime eye drops have somehow turned into King Slime eye drops!
    We've adopted an eye drop container with a "King Slime" design, which looks like a combination of the familiar Slime eye drops.
    With its plump form befitting a King Slime, it achieves the greatest presence possible. Furthermore, the glossy crown cap adds a special touch befitting the name "King." The volume is a generous 16mL, which is a large capacity compared to the regular 12mL product.

    Product bottle image

  2. Product packaging that expresses the imposing presence of King Slime

    The packaging features an original design, created from scratch, that likens King Slime to a drop of eye drops. To enhance the king's majesty and presence, the design incorporates smoke rising around him and a composition with slimes following behind, depicting the world of the product. On the back, the refreshing sensation of "ROHTO Zi" is expressed using the ice spells "Hyad," "Hyadaruko," and "Mahyad" from Dragon Quest as motifs.

    Product packaging image
    (From left to right in the image) ROHTO Zi b, ROHTO Zi Contact b, ROHTO Zi d

    *Please refer to the URL below for product details.
    https://jp.rohto.com/zi/campaign_dragonquest/

  3. The inside of the packaging also features playful surprises.

    When you open the box, a design featuring a nostalgic, retro-style black and white battle screen appears.
    By placing the King Slime eye drops on top, we've created a playful feature that makes it look like the slimes have merged. Furthermore, we've included a small hidden element that Dragon Quest fans will want to search for.

    Product packaging interior image
    (Image) ROHTO Zi D

    *Please refer to the URL below for product details.
    https://jp.rohto.com/zi/campaign_dragonquest/

What is "Dragon Quest"?

The Dragon Quest series is a representative Japanese role-playing game (RPG) in which the player takes on the role of the protagonist and unravels an epic adventure story in order to defeat the Demon King who threatens the world. Since the release of the Family Computer software "Dragon Quest" in 1986, the series has achieved cumulative shipments and download sales of over 97 million copies worldwide.
Among them, "King Slime" appears as a giant creature formed by a collection of slimes, and its unique and adorable appearance has made it one of the most popular monsters.

Product overview

Product name ROHTO Zi b
King Slime Eye Drops
ROHTO Zi Contact B
King Slime Eye Drops
ROHTO Zi D
King Slime Eye Drops
classification Category 2 OTC drug Category 3 drugs Category 2 OTC drug
Product image
Capacity/Price 16mL / 715 yen (tax included) 16mL / 825 yen (tax included) 16mL / 935 yen (tax included)
Cooling sensation level 8 8+ (Strongest★Refreshing Feeling) 8+ (Highest quality ★ refreshing sensation)
Features For tired eyes. A refreshing, clear feeling! The free-angle nozzle makes it easy to apply drops at any angle. Effective for dry and tired eyes, even with contact lenses in. Refreshing cool feeling! Free-angle nozzle for easy instillation at any angle. The moment you apply it, it spreads throughout your eyes, providing a deep, comfortable feeling. For tired eyes and blurred vision (when there is a lot of eye mucus, etc.). The free-angle nozzle makes it easy to apply at any angle.
component <Active ingredient>
Tetrahydrozoline hydrochloride 0.05%
Neostigmine methylsulfate 0.003%
Zinc sulfate hydrate 0.05%
●Chlorpheniramine maleate 0.03%
Vitamin B6 0.1%
● Potassium L-aspartate 1%
Additives: Boric acid, borax, l-menthol, d-camphor, peppermint oil, sodium edetate, polyoxyethylene hydrogenated castor oil, hypromellose, chlorobutanol, pH adjuster.
<Active ingredient>
Potassium chloride 0.08%
Sodium chloride 0.44%
●Hypromellose 0.21%
Additives: Boric acid, borax, polyoxyethylene polyoxypropylene glycol, polyoxyethylene hydrogenated castor oil, edetate sodium, polyhexanide hydrochloride, l-menthol, d-camphor, d-borneol, pH adjuster.
<Active Ingredients>
●Tetrahydrozoline hydrochloride 0.05%
●Neostigmine methylsulfate 0.005%
Allantoin 0.2%
● Zinc sulfate hydrate 0.1%
● Chlorpheniramine maleate 0.03%
● Vitamin B6 0.1%
● Chondroitin sulfate sodium 0.5%
Additives: Contains boric acid, l-menthol, dl-camphor, peppermint oil, spearmint oil, propylene glycol, sodium edetate, polyoxyethylene hydrogenated castor oil, hypromellose, d-borneol, eucalyptus oil, chlorobutanol, sodium citrate, and pH adjusters.
Efficacy and effectiveness Eye fatigue, prevention of eye diseases (after swimming, when dust or sweat gets into the eyes, etc.), eye inflammation caused by ultraviolet rays or other light (snow blindness, etc.), discomfort when wearing hard contact lenses, conjunctival congestion, itchy eyes, blepharitis (inflammation of the eyelids), blurred vision (when there is a lot of eye mucus, etc.) Eye fatigue, discomfort when wearing soft or hard contact lenses, tear support (dry eyes), blurred vision (when there is a lot of eye mucus, etc.) Eye fatigue, blurred vision (when there is a lot of eye mucus, etc.), eye inflammation caused by ultraviolet rays or other light (snow blindness, etc.), discomfort when wearing hard contact lenses, conjunctival congestion, itchy eyes, prevention of eye diseases (after swimming, when dust or sweat gets into the eyes, etc.), blepharitis (inflammation of the eyelids)

★ "ROHTO Zi Contact b" and "ROHTO Zi d" offer the highest level of cooling sensation among our products.

About ROHTO Zi ®

Since its launch in 1987, ROHTO Zi Z has captured the hearts of young people as an innovative eye drop that not only delivers reliable effectiveness but also offers a refreshing, eye-opening sensation and a unique square container that can be opened and closed with one touch. It has created and led the market for eye drops for young people. It starts with a soft, cool sensation. Then, a strong, refreshing sensation spreads across the eyes all at once, lasting for a long time, a feature unique to the ROHTO Zi Z brand.

  • "ROHTO Zi" is a registered trademark of ROHTO Pharmaceutical Co., Ltd., Ltd.
  • "Free Angle Nozzle" is a registered trademark of ROHTO Pharmaceutical Co., Ltd.

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