It's an all-girl fan service fest as Excel and Hyatt take off to the swimming pool, accompanied by local girl Cosette. But even as they laze in the sun and enjoy all the clichés of a summer episode, it appears that Cosette may have a deadlier mission in mind than simply taking a quick dip in the pool. Could such a cute little girl really be a sinister assassin? On a show like this, anything seems likely…