Top positive review
Really good anime adaptation - don't know why it's so hard to find it here in Amazon
Reviewed in the United States on October 9, 2019
Great animation, decent story-telling and action. Expect bloodshed which this is known for. In a sea of silly plots involving tons of fan-service, harem, OP highschool students and isekai (another world), it's refreshing to have anime that caters to more adult taste which Amazon Prime has been doing rather well with their original anime choices recently.
Amazon Prime Video has dramatically improved their anime selection with Darker than Black, Gurren Lagann, Rurouni Kenshin, Blue Exorcist, ToraDora, etc., and have been streaming really good original anime series (after the disastrous Anime Strike) with Wotakoi, Dororo, Vinland Saga, Banana Fish, Boarding School Juliet, Iroduku, Just Because, etc. I just don't know why it's so difficult to find out what new anime is available to watch here without going to AnimeNewsNetwork or MAL.