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cos that's not an end.this manga has 6 volumes in Japanese.
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to correct,this manga has 7 volumes in Japanese ,including 6 volumes of main biography and 1 volume of side story.each volume should be around 200 pages.
but the version here u can see is weird.not only does it simply provides the first four volumes and the side story--same as the Chinese version online,but it also shows just about over 20 pages a volume.weird...exceptionally weird...
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I think I've read one where teio died trying to save his friends.. and keika joined evil side bec. of it... I forgot the title though.. so i don't know which is it..
well this story was a bit hard for me to keep up with. It felt like I was missing parts of the story somewhere. Maybe that's the translators fault or perhaps I just need to read it again. It seemed a bit all over the place. I liked the concept and the cute guys kept me going. I also felt like The ending was rushed.