This one-shot is contained in a book called 7 Ways to Become Absolutely Beautiful (Omoikkiri Kirei ni Naru 7 Nana -tsu no Houhou) (思いっきりキレイになる７つの方法).
Additional information about this book is as follows: No one will call you ugly again!; You'll become beautiful and score a fabulous love!!; Because this is a collection of super techniques to make you absolutely beautiful!
(Source: ShoujoMagic)

Peleliu - Rakuen no Guernica follows the daily lives of Japanese soldiers taking part in the Battle of Peleliu during World War II: a high-casualty, months-long campaign. The main character, Tamaru, dreams of returning home to become a mangaka, and sees their island outpost as a wild paradise that can one day be used as a setting for one of his stories. Most of his comrades, however, are prepared for the more realistic scenario -- that they will not be leaving Peleliu alive.

Note: Nominated to the 25th Annual Tezuka Osamu Cultural Prize.

(Souce: Anilist)