It's been a while since we've had some Japanese food, hasn't it?
This is kind of weird - it's totally delicious, but not something you see in the US so....sorry about that. Branch out. It's song-of-my-people type of stuff, because I like to think that I'm Japanese, so you just have to deal with it.
Also, it's healthy and yummy so...you can be Japanese too!
My mom used to make this all the time when we lived in Tokyo, and it was a nice kid dish - salty and included fried tofu but made with a whole head of greens. I loved it, and I still do. If you leave out the dashi this is vegan, too - otherwise it's a lovely vegetarian dish that kind of can be a meal.
Oh, and. 5 ingredients. Massive flavor.