91 days is an amazing anime, one of my favorites. Its underrated. I wish it had a manga and had more episodes. This is a revenge anime but at the end I feel like the main character realizes that what he did for revenge for not worth it, it made me also realize the best revenge is no revenge and letting go. I love the opening and ending of this show especially the ending the music makes me sad, I rewatched this anime about 3 times and I cry every time. I definitely recommend this anime I love it so much, it’s great.