Tegami Bachi, Letter Bee

In a dark, amber-lit world where artificial suns create perpetual twilight, Hiroyuki Asada's Tegami Bachi, Letter Bee (2009–2017, Viz) follows the dangerous journeys of "Letter Bees"—government-employed messengers who deliver the heart and soul of human communication across a treacherous land. Asada, who both writes and illustrates the series, crafts a melancholy steampunk fantasy where letters are literal vessels of emotion, and the young Bee Lag Seeing must confront the shadows that threaten to swallow both his mail and his world. Over twenty issues, the story balances episodic delivery missions with a deepening mystery about the lost light of the sun, earning its place as a poignant meditation on connection in a fading age.