Its literally what the title says, lost chapter. This chapter can fit perfectly into the series but apparently they didn't. From the art style, story weirdness, characters personality, its all the same. At first i thought they left out this chapter because its gonna feel out of place. If they decide to include this chapter, it would be 20 chapters total in the series instead of 19, so yeah i still can't find any reason why. You should definitely read this if you haven't already. I reccomend checking out the original series first. This can work as a one shot for you to decide if youlike it or not, but i don't think its gonna be fitting to put it like that. Because you just gonna get confused of what on earth happening here. That's all i can say about this chapter. Thank you for reading my review.