As the angels work to solve the mystery of the Black Cancer, the death of Lord Seraphim triggers an even more desperate hunt. Chihaya and Kagetsuya's partnership is abruptly terminated because their relationship is growing a bit too close for comfort. Kagetsuya must now work with the neophyte Sayaka, who is a nice boy but the complete opposite of Chihaya. They go to Earth to find the reclusive Elvira, who may hold the only key to the cure. Hopefully they'll find some answers soon—mating season is approaching, and Kagetsuya is struggling with his feelings for Chihaya...