Hello Motohiro Otaki,

Thank you for your interest in our product.

1) to prevent double booking in the same room and at the same time. Yes you can achieve this with pro license 

 2) Allow customers to check availability from the calendar, make reservations, and even make payments. - They can do that form Amelias booking form 

 3) Allow subscription members to make reservations without payment for the duration of their contract. - We do not have a membership feature 

 4) Set a maximum number of hours a subscription member can reserve in a day. - We do don't have subscription feature 

 5）Change the hourly rate for weekdays, holidays, late night, and early morning hours. - No, you would need separate employee or separate service for this 

 6）Usually 1 hour minimum, but would like to introduce discount packages like 3-hour, 5-hour, all-day, and late-night (e.g., from 11pm to 5am). - Yes you can achieve this with pro license 

 7）Customers can reserve multiple time slots at once - We do not have a cart feature but it should be implemented this year  

 8）Customers can choose options such as instrument rental if they want. - You can add extras to a service 

 9) Coupons can be used. - Yes 

 10) Can I manage multiple studios within the same Web page? Or do I need to have each one separately? - At one site you can have one account. You can have multiple studios but all of them will be joined together in the back end

We wish you all the best.

Have a nice day.