It was really fun, although hot as fuck, i would suggest waiting til October to visit, or go in early Spring. If you do go in summer you will need a battery hand fan and a solar umbrella, and a handkerchief if youre a sweater like i am. Went to Tokyo, Kyoto and Hakone. It was always the country i wanted to visit the most. AMA.
"fast" food was ramen, we went to Ichiran a couple times, they have private booths to eat at solo(although i was with my gf haha)
Fancier food: PST Pizza in Tokyo was maybe the best wood fired pizza ive had. they had a pizza with shaved ice tomato that was awesome. And we had omakase at a place called Sushi Punch. The chef there was a funny guy. Also it was located basically off an alley, on the 7th floor of a building. Tokyo is so vertical it's hard to comprehend. You see tons of street level stores and restaurants, and then having a dank meal on the 7th floor is weird to my american brain.