Last year, Fire Emblem Heroes Character Illustrations Vol. 1 was released in Japan. This art book covered Books I through III and preceded the game’s 5th anniversary.
As one would expect, Volume 2 is in the works, scheduled for release on 27th May 2022 in Japan. Featuring Sharena on the cover, this volume covers Books IV and V (but not the on-going Book VI).
The book spans 480 pages with 328 Heroes (+ extras). It will cost 4,950 Yen (tax included). It’s available to pre-order from Amazon Japan and most good book stores.