Osmo X Marusan occupies a distinct underground space defined by an industrial aesthetic and a lively, resonant atmosphere. The menu emphasizes Japanese-inspired snacks such as crispy karaage and savory katsu sandos paired with delicate tamago. Guests encounter a selection of matcha and hojicha lattes prepared with deep, earthy tea profiles that balance the bold textures of the food. The venue integrates an expansive outdoor terrace that contrasts with the enclosed, modern interior design. Vibrant musical selections fill the space, contributing to the energetic environment that defines this unique hangout. These features combine to create a singular experience where minimalist architecture meets traditional flavor profiles in an unconventional setting.
Osmo X Marusan is a highly popular, uniquely designed spot in Montreal that blends an industrial, bunker-like aesthetic with a lively, social atmosphere. Guests frequently praise the high-quality matcha, hojicha lattes, and creative Japanese-inspired menu, particularly the various sandwiches and curry dishes. While many visitors find the environment perfect for working or socializing, others note that the space can become extremely busy and loud, occasionally featuring live DJ sets that may not suit those seeking a quiet retreat. Experiences regarding service and food consistency vary, with some patrons describing the offerings as fresh and delicious while others find certain items bland or the wait times excessive. Overall, the location is widely considered a trendy and memorable destination for those who appreciate a vibrant, artsy, and upbeat cafe experience.
Cool space & chill vibes (loved the music they were playing)! Delicious sandos! Friendly staff! Came on a Sunday afternoon with two friends, had no issue finding a table. Great first time experience & would love to come back again!
The vibes here are immaculate & I loved my drinks + sando! Such a cute spot to work (though a lot of the seating is social only) & it was super chill in the morning. Gets busy at 11 when the lunch menu comes up but it's worth it!
I only wanted a quick brunch item, so I swung by for the Tamago Sando after a wait of 10 min to order.
I actually liked the industrial vibe of the cafe, matching many of buildings & stations in Montreal, brightened up with the skylights & disco ball. There was more table space than expected from reviews, & I would def come back to work here.
Unfortunately, the Tamago Sando was just okay. It was a bit bland, nothing I'd strongly recommend to others. I didn't try the drinks this time around though.
Jun 9, 2026
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I came here just after 2 p.m. specifically for the egg sando, only to find out they were sold out. Since I hadn't come up with a backup plan, I let the really kind hostess pick both my sandwich & coffee for me. You order, grab a seat, & wait for your name to be called when everything is ready.
The restaurant is easy to miss. It's set back from the street &, partially hidden behind overgrown weeds & litter. Once you find it, the space is actually below street level & has a retro, almost 1970s bunker-like vibe. There's plenty of indoor & outdoor seating, though some of the less-used furniture & fixtures could use a good dusting.
I ended up with the karaage sando & a matcha. The matcha was strong, which I appreciated. The sandwich was very meaty, though I wasn't a fan of some of the rib meat pieces.
Overall, I'd say it's a hipster hangout with a solid menu. Just be sure to get there before the kitchen closes at 3 p.m. & even earlier if you have your heart set on something specific.
Took Pork Katsu Sando with Matcha & Matcha cookie. Sandwich was tender & well marinated/seasoned. Will have to come back for the egg sandwich. Matcha & Cookie were very good. Loved the location, like an underground concrete bunker peeking at the sunlight.
loved the sandos, the drinks were also really nice. Would love to come again in the future, very cute spot. A bit hard to find seats though & very crowded
A couple who I met at a bar tipped us off that this is the spot blowing up on IG. Apparently, there's a pretty cool underground cocktail lounge, but we just stuck around for the cafe.
Not sure why, but I almost always defaulted to iced when it comes to matcha & hojicha lattes. I honestly can't remember the last time I ordered one hot, so it was just nice to switch it up & taste something different. Nothing special but still a really solid cup.
The Tamago Sando was fantastic though. Wished the kitchen hadn't forgotten the smoked salmon I added, but even without, it was great. A perfectly fried jammy egg, cracked pepper, & Mornay sauce. Not the traditional Japanese Kewpie mayo route, but this fusion with French Mornay sauce based on béchamel base loaded with Emmental cheese, gave the whole thing a nice savory boost.
somehow this is the worst japanese food ive ever had. the tamago sando was alright, but not as tasty as it looked. the miso soup was flavorless, which i cannot fathom how you could mess up miso soup, packet soup literally tastes better than this. the best part of my meal was the rice, pickled raddish & yuzu green tea.
