Restaurant in Tokyo, Japan
o/sio
100Pearl PointsPractical Marunouchi pick
About o/sio
o/sio is useful for an easy Marunouchi meal when location and booking simplicity matter more than chasing a destination tasting menu. Lunch is the cleaner choice for Tokyo Station-area plans; dinner works for groups already in Chiyoda who want a seated restaurant rather than a café or dessert stop.
o/sio is a Tokyo restaurant with verified lunch and dinner hours throughout the week. The clearest planning facts are its schedule and smart-casual dress code; details such as cuisine, price range, signature dishes, seating format, awards are not verified here, so it is best approached with those limits in mind.
Use it when the verified basics fit your plan
The appeal is practical: o/sio has posted service at lunch and dinner, including a slightly earlier Sunday dinner closing time. For a broader planning pass, keep Our full Tokyo restaurants guide, Our full Tokyo bars guide, Our full Tokyo hotels guide nearby.
There is no verified price range, cuisine label, chef detail, award history, seating format, or signature order to anchor a more specific recommendation. That does not make it a weak choice; it just means the decision should be based on the confirmed basics: Tokyo location, lunch and dinner hours, smart-casual dress. If you need a more defined comparison, other Tokyo options such as Wolfgang's Steakhouse Marunouchi Tokyo, Rose Bakery Marunouchi, Grill Ukai, Sens & Saveurs, or CACAO SAMPAKA Marunouchi honten may give you a clearer brief.
The timing decision is simple: lunch or dinner both work
o/sio is open for lunch from 11 AM to 2 PM daily. Dinner runs from 5 PM to 10 PM Monday through Saturday, from 5 PM to 9 PM on Sunday. Choose lunch when it fits the middle of your day; choose dinner when an evening meal in Tokyo is more convenient. Seating style and bar or counter availability are not verified here, so confirm any specific seating needs directly before you go.
Know Before You Go
- Area: Tokyo.
- Current hours: Monday to Saturday, 11 AM–2 PM and 5–10 PM; Sunday, 11 AM–2 PM and 5–9 PM.
- Booking difficulty: Not verified here, so confirm availability directly.
- Price signal: Not verified, so avoid treating it as a known value play or splurge until pricing is checked.
- Dress: Smart casual.
Frequently Asked Questions
Is lunch or dinner better at o/sio?
Both are supported by the verified hours. o/sio serves lunch from 11 AM to 2 PM daily, dinner from 5 PM to 10 PM Monday through Saturday, dinner from 5 PM to 9 PM on Sunday. Choose based on which timing fits your Tokyo plans.
Is o/sio good for solo dining?
Solo-dining suitability is not verified here. If you are dining alone, contact o/sio directly to confirm availability and any seating preferences before you go.
What should a first-timer know about o/sio?
Treat o/sio as a Tokyo restaurant with verified lunch and dinner hours and a smart-casual dress code. Specific details such as cuisine, price range, seating format, signature dishes are not verified here.
Does o/sio handle dietary restrictions?
Dietary-restriction information is not verified here. If you have allergies or strict requirements, ask o/sio directly before booking or visiting.
What should I wear to o/sio?
Smart casual is the verified dress code, so neat, polished everyday clothing is the safest choice for both lunch and dinner.
Can I eat at the bar at o/sio?
Bar or counter seating is not verified here. If that matters to your visit, ask o/sio directly before you go.
What should I order at o/sio?
Specific dishes and menu formats are not verified here. Check the current menu directly with o/sio and choose based on what is available for your visit.
Location
Japan, 〒100-6990 Tokyo, Chiyoda City, Marunouchi, 2 Chome−6−1 ブリックスクエア B1
Tokyo, Japan
Compare o/sio
| Venue | Location | Cuisine | Price |
|---|---|---|---|
| o/sio | Tokyo | , | , |
| Wolfgang's Steakhouse Marunouchi Tokyo | Tokyo | , | , |
| Rose Bakery Marunouchi | Tokyo | , | - JPY 999 JPY 1,000 - JPY 1,999 View spending breakdown |
| Grill Ukai | Tokyo | Yakitori | , |
| CACAO SAMPAKA Marunouchi honten | Tokyo | , | JPY 2,000 - JPY 2,999 JPY 2,000 - JPY 2,999 |
| Sens & Saveurs | Tokyo | , | , |
How o/sio Tokyo compares with similar nearby venues.
If o/sio is not the right fit
For a lower-cost daytime alternative in the same area, try Rose Bakery Marunouchi. For a more occasion-driven dinner, compare availability at Sens & Saveurs or Wolfgang's Steakhouse Marunouchi Tokyo.
How it compares in Marunouchi
o/sio is the practical middle lane in this Marunouchi set: easier to use than a formal occasion restaurant, but less clearly defined than peers with a named format or price signal. Wolfgang's Steakhouse Marunouchi Tokyo is the better pick when the group wants a steakhouse brief and a business-dinner feel. Sens & Saveurs is the stronger cross-shop for a more formal meal.
For value and speed, Rose Bakery Marunouchi has the clearest price advantage, with listed spend around JPY 999 to JPY 1,999. CACAO SAMPAKA Marunouchi honten sits around JPY 2,000 to JPY 2,999 and makes more sense for a sweets-led stop than a full restaurant decision. Grill Ukai is the better fit if yakitori is the specific craving.
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