The "Developer Tools" tab does not work, maybe because my account is managed by my school, even when school break is occuring (like between school years, like right now.) "Developer Tools" is also grayed out...
Viewing post in Delivering Hope (hololive fangame) comments
Oh, unfortunately it's possible the game won't run because you're using a limited account, such as the one provided by your school.
They may have limited other settings in the browser that prevent the game from loading or accessing your local data (which is used by the game to store and read the save file). :(