Promise
The entire episode is a summary of Cal's life with Reiji with a few added scenes. While Reiji's apartment was bombed by Inferno's attack, Cal was actually out shopping in a store. For a few days, Cal remained in the apartment ruins waiting for Reiji to return but he never showed up again, since he's now on the run with Elen. Scythe Master appears to Cal and encourages her false belief that Reiji has abandoned her and broken his promise. Meanwhile, Reiji and Elen have headed to the outskirts of Mexico.
Aired 07/08/2009EP 19 - Promise
Phantom: Requiem for the Phantom
A young man wakes up in a strange room with no memory of who he is or how he got there. His past is lost—and his future belongs to Inferno, a violent crime syndicate. They give him a new name—Zwei—and team him with their top assassin, the enigmatic Ein. She’ll teach Zwei all he needs to know about his new life as an Inferno operative, starting with lesson number one: kill or be killed.
(Source: Crunchyroll)