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If you're looking for manga with similar themes or elements, here are a few recommendations:

The final panel: two hands, scarred from gripping too tight, woven together like roots. Above them, a starry sky. Below, an abyss. And in the middle — a tiny, unextinguishable ember. seiyoku tsuyotsuyo manga extra quality

Short 2–4 page bonus stories or "after-talk" comics from the artists. If you're looking for manga with similar themes