Shoujo Shuumatsu Ryokou: One True "Sisterhood"

I can see that the term One True Pairing is pretty overused in fiction. Thus, why don't we use probably better terms like One True Sisterhood or Brotherhood or...whatever?

P.S.: I enjoyed watching the Girls' Last Tour anime since my keen eyes can spot the development between Chito and Yuuri. Besides, since my 23rd birthday party.

© Chito and Yuuri by Tsukumizu
© artwork by Christine Lim