Bakudan's menu has one bowl explicitly labeled Vegetarian, but it isn't the only thing on the menu that works if you don't eat meat. Here's the fuller picture.
The Vegetarian Ramen Itself
Built on an oat milk and garlic oil base rather than a meat broth, with tofu, spinach, cabbage, garlic chips, and green onion over thick noodles. It's the only bowl on the Ramen menu built without any animal-based broth.
Starters That Work
Edamame and Bakudan Edamame (the spicy garlic version) are both straightforward vegetarian starters. Beyond that, it's worth asking about specific starters if you're unsure, since not every item on that list is confirmed meat-free.
From the Not Ramen Section
Bakudan Salad — spring mix, red onion, carrots, cucumber, avocado, egg, with sesame dressing — is a non-ramen option worth knowing about if you want variety beyond the one vegetarian bowl.
Dessert Works Regardless
Mochi Ice Cream, the only dessert on the menu, isn't meat-based, so it's an easy closer to a vegetarian meal here.
If You're Ordering for a Mixed Table
A vegetarian diner at a table full of meat-eaters isn't an awkward fit here — between the Vegetarian ramen, Bakudan Salad, and Edamame, there's enough range that everyone can order what they actually want without the table needing to compromise.