Found this extra chapter where the author described the creative process (i think) but it's in Russian http://yaoichan.me/online/311883-blood-bank_v1_ch62.html
im pretty sure the english version is free on lezhin https://www.lezhin.com/en/comic/bloodbank/e1
Found this extra chapter where the author described the creative process (i think) but it's in Russian
http://yaoichan.me/online/311883-blood-bank_v1_ch62.html