Hayate the Combat Butler (Hayate the Combat Butler #22)

In Greece, Hayate finally finds his mysterious moe childhood love, Athena. But Athena claims to have no memory of their past together. How could she have forgotten that weird disappearing castle with the smoke monster and the giant clock? It wasn't that many volumes ago. At any rate, if Hinagiku is ever going to confess her feelings to Hayate, she'd better do it now...