星を追う子ども アガルタの少年 [Hoshi o Ou Kodomo: Agartha no Shounen]
Book Series
by Asahi Hidaka
Latest:
2012
Book 1
星を追う子ども 1 (Hoshi o Ou Kodomo 1)
by Makoto Shinkai, 新海誠, Tomoko Mitani
Book 2
Hoshi wo Ou Kodomo: Agartha no Shōnen (Volume 2)
by Asahi Hidaka, ひだかあさひ, Makoto Shinkai