
If you're looking for manga similar to Summerless, you might like these titles.
In the future, humanity has destroyed the world’s plant and animal life out of greed and consumption. Meat is biologically created from animal cells to eat, and little remains of what used to be the environment. However, when a mutated, engineered chicken breast morphs into a sentient, vengeful being and human children begin to be born with green hair and spots, it becomes clear that mankind’s fate is anything but secure…
A girl with prosthetic limbs and a tragic past wanders a zombie-ridden 23rd century earth now known as Death’s Amusement Park. Overrun by monsters, the post apocalyptic wasteland is the last place a little girl should call home, but she’s developed a unique coping mechanism…
Two of the most acclaimed anime directors of all time, Ghost in the Shell’s Mamoru Oshii and Perfect Blue’s Satoshi Kon, came together to create a manga: Seraphim: 266613336 Wings. Seraphim is the story of a future earth devastated by the “Angel Plague,” a pandemic that induces apocalyptic visions in the afflicted, even as it ossifies their bodies into dead, seraphic forms.
One of the first published works by famed Berserk mangaka, Miura Kentaro. It follows the heroic lone wolf, Noa, in a desert-punk post-apocalypse.
Zombies occupied Japan in only a month. To avoid being infected by zombies, Eito Hasaba, along with his mother and younger sister, head for a "sector," a blockaded safe zone. But soon after their arrival, Eito gets seriously injured during a disagreement and is thrown out of the sector. With his consciousness dimming, Eito sees a pack of zombies coming and resigns himself to his fate. But what does he discover when he wakes up? A story of a living dead anti-hero begins.
Goodbye Eden is a story of youth set in a post-apocalyptic Japan. While downing the "medicine," the government provided them with the purpose of dimming their fear, middle school students are armed with weapons to fight back against the "enemies," that assail them. Among them is a girl named Chikori, a normal girl who wishes to fall in love. However, with the world as it is, normality is difficult to uphold.