Nagi Yanagi to simultaneously release two best albums. "LIBRARY" contains 15 tracks in total with "Yukitoki" --intro theme to TV anime "My Teen Romantic Comedy"--, "here and there" -- intro theme to TV anime "Kino's Journey -the Beautiful World-"--, "Laterality" --outro theme to TV anime "Jormungand PERFECT ORDER"-- and more. Limited Edition w/ Blu-ray comes with live footage of "Yanagi Nagi Live Tour 2018 Natte" held at Zepp Diver City Tokyo on April 21, 2018.