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I really liked it, but the ending turned out to be too difficult for me...

I only liked the ending. In general, I think the anime is mediocre; only the music is good, but the characters, plot, and atmosphere... are not very good.

By the way, I only got interested in this anime because it doesn't have a hundred episodes, like in some other anime.

There are many good short anime, for example, "Trapezium" and "The Legend of the Four Tatami Mats," although these are for those with specific tastes. There are also "Usavich," "APH," and "Useless Beasts," where the episodes are short.