Spin off of Akai Ito No Shikkou Yuuyo! http://www.mangago.me/read-manga/akai_ito_no_shikkou_yuuyo/ Sequel: Tsunaida Koi no Kanaekata https://fujoshiundercover.tumblr.com/tagged/tsunaida-koi-no-kanaekata
Kanawanu Koi no Musubikata