One month. One pivot. One category.
April 12, 2016. Facebook opens the Messenger chatbot API to developers. Most founders note it on a list somewhere. Masa Shimizu ships a product. Thirty-one days later - May 13, 2016 - ZEALS had its first chatbot live and a new category forming: Chat Commerce.
That reflexive speed is not a lucky chapter in his biography. It is the operating system. Shimizu founded ZEALS in Tokyo on April 1, 2014 as a university freshman at Meiji University in Okayama-born hustle, no elite Tokyo pedigree, no family fund. The original pitch was robots: Japan's shrinking workforce needed co-pilots, and a generation of founders had convinced themselves hardware would save the country. Shimizu included.
The robots didn't work out. Capital was too heavy, technology too early, market too thin. What the robot phase did produce was a question that turned out to be worth far more than any prototype: What if the interface was already in everyone's pocket?
"Chat commerce is hearing-first rather than proposal-first."Masa Shimizu on why traditional e-commerce gets it backwards
Traditional e-commerce presents a discount and a product description before it knows anything about you. Chat commerce reverses the sequence. You ask, the conversation shapes the recommendation, the purchase follows understanding rather than interruption. Shimizu packaged this insight under the Japanese concept of Omotenashi - the hospitality that anticipates your needs before you name them - and built a platform that turns messaging apps into guided shopping experiences.
By the time ZEALS reached its Series E in May 2022, raising 5 billion yen alongside investors including Salesforce Ventures, JIC Venture Growth Investments, Z Venture Capital, and Japan Post Capital, the company had over 400 enterprise clients: NTT Docomo, Asahi Beer, Estée Lauder, MAC Cosmetics, L'Oréal, Shiseido. It was Japan's dominant platform in a category Shimizu had essentially coined and built from a freshman dorm room.
Then, in September 2022, Shimizu packed the company's ambition into a Delaware subsidiary and moved operations to San Francisco. The U.S. was never a second market. It was always the point.
The IPO that almost was: ZEALS was approved for listing on the Tokyo Stock Exchange Mothers Market in late 2021, scheduled for December 23. Then global markets collapsed. Shimizu pulled the listing, returned to investors with a fresh story, and closed Series E instead. San Francisco followed. The postponed IPO was not a setback - it was the move that created the U.S. company.
Before university, Shimizu worked in a factory in Okayama Prefecture - an experience he credits for shaping his view of technology as a practical tool, not an abstraction. The factory floor, not the pitch deck, is where he learned that if something is too complicated to explain, it probably doesn't work.
If chatbots suck, make them speak
The insight behind Omakase.ai is annoyingly obvious in retrospect. Chatbots are bad because they make you type. The best shopping experience in the world is not a text box - it is a conversation with a great store clerk who reads your hesitation, notices what you glance at twice, and pulls exactly the right thing from the back. Shimizu built that in voice.
Omakase.ai Voice launched in January 2025 and ranked #1 Product of the Day on Product Hunt on January 13. In three months the platform generated over 10,000 AI agents globally. ARR crossed $100,000 in the first month. The name is deliberate: omakase in Japanese dining means "I'll leave it up to you" - the chef curates. Here, the AI curates. The shopper just talks.
Drop a URL. Get an AI sales agent. That's the product. No setup forms, no mapping, no development sprint. Just a URL.
The platform sits at the intersection of two trends Shimizu has been watching since 2016: social messaging as a commerce channel, and AI that understands intent rather than keywords. ZEALS spent years building the conversation design muscle - fewer than 0.1% of users ever type free text in its chat experiences; the rest use smart replies, guided flows, and structured interactions. Omakase.ai applies that decade of conversation data to voice, at global scale.
In late 2025, Shimizu appeared on One Amazing Thing with Greg Kihlström alongside Senior Engineering Manager Or Perlman, describing the shift from text-based chat to agentic voice commerce as the same leap that separated search from social - a new interaction paradigm, not a faster version of the old one.
My ambition is Omotenashi revolution from Japan to the world.Masa Shimizu - core mission statement
Defy existing common sense and create new value.From ZEALS new employee ceremony, April 2025
Delivering that future from Japan to the world - that is ZEALS' mission.ZEALS corporate vision statement
The underdog is the identity, not the excuse
At ZEALS' April 2025 entrance ceremony for new graduates, Shimizu delivered the kind of message that sounds deceptively simple until you sit with it. The word was underdog: those who confront adversity, keep striving, and achieve something. Not a motivational pivot, not a rallying cry. A job description.
He has earned the framing. ZEALS was built outside Tokyo's elite university pipeline, without the startup scene shortcuts that come from Keio or Tokyo University connections. It was built in a category no one had named yet, on a platform (LINE, then Instagram, then Facebook Messenger) that most enterprise software companies were ignoring in 2016. It was built by a founder who worked a factory job before enrolling in university, who started a robot company that didn't work, and who then found the inflection point in a Facebook developer blog post.
A decade in motion
From $0 to $100K ARR in Month 1
Masa Shimizu on building eCommerce AI Voice Advisor and taking Omakase.ai from concept to revenue in 30 days.