謎の彼女X [Nazo no Kanojo X]

植芝理一's 謎の彼女X (Nazo no Kanojo X) is a singular, decade-long romance manga from Kōdansha, serialized from 2006 to 2014 across 12 volumes. Written and illustrated entirely by 植芝理一, the series builds its strange, tender love story around a bizarre premise: the heroine, Urabe, transfers her mysterious drool to her boyfriend, allowing him to share her emotions. Its cult appeal lies in how it treats this oddity with deadpan sincerity, crafting a genuinely sweet and quirky relationship drama that stands apart from conventional romantic comedies.