Seishun Mermaid

 is the third major single released by Houkago Princess. It was the first single since 2012 to not feature Ayase Miho and the first single since 2014 to feature Cadet members.

CD

 * 1) Seishun Mermaid
 * TBD
 * 1) Seishun Mermaid (Instrumental)
 * 2) TBD (Instrumental)

Limited Edition DVD

 * 1) Seishun Mermaid (Music Video)

Featured Members

 * Odagiri Nana
 * Miyashita Mayuka (Last)
 * Yamaguchi Miran
 * Kizuki Saori
 * Miyashita Maika
 * Shirosaki Himari
 * Michishige Saho
 * Kojima Mayumi (Cadet)
 * Nagasawa Marina (Cadet)
 * Sekine Sasara (Cadet)