If you're looking for manga similar to Leave, you might like these titles.
Sachiko and Ichiro are a couple who can't seem to find their ways in life. While ruminating on the states of their families, jobs and relationship, the pair pass the time smoking, drinking, and having frequent sex, all the while trying to figure out what to do next.
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Red-Colored Elegy and Leave reminded me of each other, as both are somewhat abstract love stories with unique visuals.
Just like mushrooms that grow as a log rots, memories collect as life goes on. Even though you might not remember anything right now, they are still there. And will eventually be remembered.
Minori wonders about the true nature of the relationship between her childhood friend Tsugumi, who she likes, and her twin sister Kozue.
Fourteen-year-old Little Mo was bullied and called Godzilla by her classmates. Many years later, Mo realizes that life cannot be changed. What happens, happens. The things she had cared about when she was fourteen make herself look childish in her own eyes, and have become something to laugh at. The things that made her sad and hurt when she was fourteen still invoke a dull ache in her heart today. By reading the notebook of fourteen-year-old little Mo, the Mo of present-day begins to speak and console herself silently. This is a story about growing up and how children become adults.