'Failure Will Make My Pen Sharp as a Blade: My Writer's Life in Another World' will from this point be referred to as 'FailPen' for simplicity's sake.
FailPen has, perhaps, the most despondent introduction to a story I've read, and the story does not let up from there; every other chapter has our poor main character Aya hear something that makes her world fall apart.
Speaking of Aya, she is a good main character. She's understandable, and the way she reacts is fitting for a hero. Despite her flaws (namely self-pity and despair) she strives to do the right thing whenever she can.
The thing that makes Aya a hero, however, is not whether she succeeds or fails: it's the fact that she consistently puts the needs of others above her own.
At the beginning of the story, we see Aya's worst failure: she puts her own self-pity and disappointment in life ahead of the cares and worries of her family and friends and decides to stop living.
This is her greatest failure, and the rest of the story is her, for lack of a better word, atonement for this failure.
After talking with the gods and being transported to the new world, she begins to learn the amazing art of 'Self-Forgetfulness' (both literally and figuratively). She puts the needs of others so far above her own that she is willing to disappear if it means that just one more person would survive.
At first, she does this only in small amounts, but soon she begins looking for people to help. In effect, the entirety of FailPen is Aya becoming a true hero.
By no means is Aya perfect; but she doesn't need to be; she needs to be self-forgetful (besides, there's only ever been one perfect hero).
FailPen is not a technically perfect story: there are some grammatical errors and storytelling mistakes, and I don't agree with everything that's written (also there is some swearing but that's a personal thing).
But FailPen is the perfect story to teach self-forgetfulness, and what it means to be a hero.
I would happily recommend FailPen to you, dear reader, if you wish for a story to make you forget yourself.