It all started with Cro-Magnon 1

Reina Uchida's "The Beginning is Cro-Magnon" Volume 1

This manga is written by artist Reina Uchida and centers around a Cro-Magnon protagonist modeled after herself, who grows as an artist together with her friends. The story, which is linked to the present day, is drawn in pencil.

Based on the theme of cave murals, which are said to be the origin of painting, this is a story of love and growth in which the Cro-Magnon protagonist, Reina, grows as a painter despite facing various difficulties.
This is the memorable first volume.