Board Thread:Questions and Answers/@comment-174.52.17.14-20150609015120/@comment-9022130-20150609015347

Each of the 7* is different. You can look at each individual 7* page for the requirement.

For example:

Selena needs to equip Lexida

Kanon just need to unlock UBB, same as Elimo

Sefia would need Holy Eight