These are designed to be worn without the need for piercings - the rings have spring-operated openings to clip onto lips or ears.
Horimiya Kyouko Hori seems like an average teenage girl, but she has a different side outside of school that she wants no one else to ever find out about. Brought up in a household where both her parents are absent from working, she needs to take care of the house and her little brother, unable to lead a normal social life. Likewise, there is her classmate Izumi Miyamura, who has a different side out of school that remains hidden from others. When the two meet unexpectedly, they discover each others' secrets and develop a special friendship. (from Fandom Horimiya Wiki)
Nana The story follows Nana Komatsu and Nana Osaki, who meet coincidentally on a train to Tokyo. They become roommates and develop a close friendship. (from Fandom NANA Wiki)
