This IS NOT the prequel to Kobi No Kyoujin! It's just a summarised version for son reason, I don't get why though. But the chapters here are all also in Kobi No Kyoujin but with other chapters completing the FULL story between. BRILLIANT MANGA
I think it is because Kabu-san said that the event in Bi no Isu occured 4 years ago and continued with Kobi no Kyoujin... http://www.mangago.me/read-manga/kobi_no_kyoujin/mf/v01/c001/17/
MUST READ GUYS! IT'S SOOOO CUTE AND GREAT
This IS NOT the prequel to Kobi No Kyoujin! It's just a summarised version for son reason, I don't get why though. But the chapters here are all also in Kobi No Kyoujin but with other chapters completing the FULL story between. BRILLIANT MANGA
I think it is because Kabu-san said that the event in Bi no Isu occured 4 years ago and continued with Kobi no Kyoujin... http://www.mangago.me/read-manga/kobi_no_kyoujin/mf/v01/c001/17/