There is an app called "ecbo cloak" about cloak rooms that is useful while traveling Japan.
There are some coin lockers in and around stations and bus stops in Japan.
In downtown areas, the lockers are often fully occupied, especially on weekends, and sometimes your stuff doesn't fit into the lockers.
You might be at a loss as what to do.
I will introduce a useful app about cloak room for tourists.
Instead of using the coin lockers, you can store your stuff in places such as restaurants, department stores, post offices and so on when you make a reservation online and pay by credit card.
Please take a look at the website for the app below.
ecbo cloak - luggage storage with your smartphone
ecbo cloak is an alternative to a coin locker that allows you to leave your travel luggage and other belongings in a vacant space in a store near a train station.
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I recommend you choose 24 hours place to store your stuff, because you don't need to care about their closing time.
When I went sightseeing around Shibuya 渋谷 Tokyo, I used Karaoke BIG ECHO located near Shibuya Station (1 minute walk).