Popular mobile phone game The Alchemist Code will feature some familiar faces in the following days. Mobile game publisher gumi Inc announced their forthcoming collaboration with popular series Attack on Titan.

Starting on June 6, players will have the chance to use Attack on Titan characters Eren, Levi, Mikasa, and Hange for a limited time. Players can also earn Reiner Braun for free after completing the first collaboration quest. On The Alchemist Code’s side, new characters Judith and Bud will debut during this event.

The pairing of the two worlds will be told in a special in-game collaboration story. During this game, players can earn Attack on Titan mementos “Victorious Crimson Arrow” and “I Won't Surrender to the Flames of Vengeance”. The event will last until July 3.

If you’re looking to try this game out, pick up The Alchemist Code over on Google Play, the App Store, and Amazon App Store.