Legendary Event

Legendary girls are obtained from legendary events, which include the following parts: gacha with increased chances of dropping girls of certain faction; special events and a regular stages event.

Gacha
Super Gacha [faction] is located in recruit tab under normal Super gacha and have same prices: 100 gems for 1 and 450 gems for 5 Commons are x3 increased Rare is x4 Epic is x5

Daily login
Obtain some amount of each girl of faction

Open Gacha
Obtain additional fragment for opening X Super [Faction] Gacha. Last mission requires you to open 250 gacha in total (costs 22500 gems) and gives 50 fragments of epic girl. All rewards can be doubled with Celestial ticket.

Legendary Event
To unlock legendary girl you need to pass 5 stages