漆黒の手帖（顧客管理_水商売用）

It is a management system (database) that is handy as a handbook of customer management, mainly for hospitality business.
It manages not only the data of your clients and contact information but also the information on the frequency of visits, total payment, anniversary, and taste preferences.
We have systemized many elements such as nicknames, photo management, gift management, etc. It is perfect for forgetful people.