Nagasarete Airantō : ながされて藍蘭島 - "Nazomeite, Tantei (Kōhen)" (謎めいて、探偵 (後編)) Episode 20

Beniyasha has succeeded in taking out the girls one by one, except for Rin and Machi who were distracted. Though none are hurt, his "attacks" cause many problems and nosebleeds for Ikuto. After a rooftop confrontation, Ikuto tries to chase after him. Unknown to everyone else, it was actually Chikage's mother in disguise. She and her daughter had a talk about him and how he could be the master of the next generation. This could mean the ninja clan that Chikage and her mother come from.