Genshi Otome to Kami no Tou

Genshi Otome to Kami no Tou (Japanese: 原始乙女と神の塔, English: Primeval Maidens and the Tower of Gods) is a 2014 science fiction manga by Shiomiya Iruka featuring a prehistoric aesthetic.

Plot
Set in a post-apocalyptic future, humanity lives in a vast jungle with stone age technology, hunting animals like bears and mammoths for food. The landscape is dominated by a gigantic "Tower of God" (the ruins of Tokyo Tower), said to be where the treasures of a past world were hidden after the previous world was destroyed by the gods.

The Treasure of Wishes
The young girl Kishin wants to be friends with the best hunter in her village, Yuuno, but Kishin is bad at hunting. After Yuuno is injured, they journey to the Tower of God, hoping to find treasures which will solve their problems. The two encounter and battle dinosaurs, eventually being chased to the ruins of a shopping mall. During a hopeless battle with a Tyrannosaurus, Kishin finds a pair of glasses, allowing her to aim a spear throw which defeats the dinosaur. Having made a friend in Kishin, the two return to their village.

The Treasure of Promises
The twin girls Sei and Sou find a lighter, which they take to be the fire-breathing baby of the guardian of the Tower. They use the lighter to easily make fires in their village, but it runs out of fuel. At the same time, a solar eclipse occurs and the village falls into chaos. The twins beg their lighter to light one last fire, which coincides with the return of the sun. They bury the "dead" lighter and thank it for helping them one last time.

The Treasure of Good Fortune
Fukko leaves her village to journey to the Tower, hoping to cure her misfortune by finding a treasure. On the way, she is saved after a landslide by a girl named Ageha from a different village, also going to the tower. They meet another girl obsessed with eating meat, and make their way to another abandoned mall. Ageha finds a mirror, and Fukko finds a large maneki-neko figurine. Preparing to head back, the trio are attacked by a sabre-tooth tiger. Meat attacks it, and Ageha and Fukko combine their treasures to attack the tiger. It becomes affected by Fukko's bad luck, smashing into a clutch of pterosaur eggs, and Fukko is carried off to the Tower. Meat throws Ageha at the pterosaur, carrying off both of them, as they were tied together. Fukko tears off her bracelet, which is meant to protect her from the worst misfortune. A meteor strikes a satellite, causing rocks to fall from the sky, distracting the pterosaur. Meat defeats it, and the trio land safely, but without any treasures. After eating the entire pterosaur, Meat tells Fukko that her misfortune will soon be gone, then returns to normal.

Characters

 * Kishin, an inept but hard-working girl, who dreams of becoming a skilled hunter and friends with Yuuno. She finds a pair of glasses which allow her to see better and aim her spear throws.
 * Yuuno, the greatest hunter in her village, she looks down on others for not being equal to her, but is cast aside when she injures her arm and becomes useless.
 * Sei and Sou, mischievous twin sisters who find a lighter.
 * Fukko, an unlucky girl.
 * Ageha, an exuberant girl concerned with her appearance.
 * Meat, a girl wearing a bear costume who loves and only says "meat".