Equipment materials can be acquired from the following:
● Story Quests - a list of available quests where the equipment material can be obtained when you tap the specific equipment and select "How to Obtain"
● Limited Time Events - there are events where equipment materials can be acquired
● Shops / Secret Shop - you can purchase equipment materials from the shop using Zeni and gems
● Coin Exchange - you can also exchange certain equipment materials using coins (Multiplay/Arena/Event coins)