Its a tactics game (grid-based combat) if a character is marked "End" it means that particular character turn is done for that round but the other characters can still move/take action. Personally I've always wished it would say "Done" and reserve "End" for ending your round because alot of these games have the option to finish your turn before acting with all your units and can occasionally lead to a miosclick ending your round instead of turn.
Since this isn't released yet all it's doing to me is having pray to Ploutus to spontaneous spawn 60$+tax for me to pick up FE: Awakening