Sayonara Crystal Man

Overview

Eight years have passed since the death of the Giant of Hope, Crystalman—yet his enormous corpse remains just as it was that day, still slumped against the city. Has humanity truly attained peace? On Hope Day, the anniversary of Crystalman’s death, as the survivors offer a moment of silence for those who sacrificed their lives for the future, a certain plan begins to move under the direction of Defense Agency Deputy Director Keisuke Kamiya. Meanwhile, a glowing pen known as the Crystal Pen is delivered to Yohei Nozaki, who once fought alongside Crystalman… (Source: Pocket Magazine, translated)

Source: AniList