not enough unless u dun shop and eat on budget

will u be going to any theme park such as disney or universal?

list out what you do then we can estimate.

so lets assume the cheapest per meal is 1k yen for a big bowl of ramen and egg (usually will spend more like 2-3k if u go for sushi and so on), so 3 meals per day for 7 days thats 21k already.

transportation if its only around tokyo on jr line that should be roughly 1k yen per day, if u go places further away such as yokohama then its easily 2k yen per day. so thats 30k yen already.
jalan jalan buy drinks buy snacks 1k yen per day, 37k yen d. so u left with around 60k yen or less for shopping. so im guessing 100k yen should be ngam ngam, tht day i went 10 days i spent 5k myr on foods, transportation and light shopping. (i ate expensive stuff tho, one set of wagyu beef 9k yen d)