Cut the pea sprouts in half and slice the garlic thinly.

Mix the natto with its included sauce in a bowl.

Boil water in a pot and cook the spaghetti according to package instructions. Reserve 2 tbsp of pasta water and drain the rest.

Heat olive oil and garlic in a frying pan over medium heat until fragrant. Add the spaghetti, pea sprouts, soy sauce, and reserved pasta water, then stir-fry briefly.