夢で笑って。

I don't really feel like I understood the point of the story but it was good study material. At Wanikani level 20, you'll see a lot of kanji that you just learned like 夢 and 悪夢. There will still be a lot of lookups, but hopefully you'll pick up on some things pretty fast; a lot of them are pretty useful like 先輩 and 久しぶり. It's only 44 pages so you could probably do it in a session or two at this level, pretty bite sized.