One main sad moment was when Ash was separated from Pikachu. They are such a close pair, and being apart was really tough on them. It made Pikachu feel lonely and Ash felt like he was missing a part of himself.
Time is something that catches people off guard. The past has passed, the future has come, and only the present remains.
Those people who I thought would be together forever gradually disappeared from each other's lives. No farewell, no goodbye, only wishing you happiness.
When a special person appears in your life, you will, you will, you will start to live a different life. This is the meaning of love.
Leaving doesn't mean it's over, nor does it mean you can't start over.
Nezuko is initially 12 years old in the manga. As the story unfolds, her age doesn't change significantly in a traditional sense, but her character development is quite remarkable.
A simple Nezuko and Zenitsu fanfiction could be that they go on a journey together. Along the way, they encounter other demon slayers who are initially skeptical of Nezuko. But Zenitsu stands up for her, explaining that she's different. This shows the depth of their friendship and how Zenitsu has come to trust Nezuko completely.