Grisaia no Rakuen

Main character is kidnapped by evil organization and trained as assassin. He is forced to kill against his will. Finally he rebel and fight against organization which destroyed his life. Main character is controlled by darkness, grief, lost meaning in life. He meets something special which helps change, find light in the dark. Both are great action, philological anime. Main difference is that Phantom is darker and sadder, and in Grisaia you can find harem.  

Both of these animes center around an OP protagonist with a dark past who wants to live a normal life but external forces prevent him from achieving it. So, he is forced to counteract against them and save his friends. Some other similarities are- - Emotionless and very skilled professional protagonists - VERY close relationship with blood related sister - Themes of terrorism and military involvement 

Both have same vibes where ML is powerful. He is popular among all FL's, but he is oblivious of their feelings. They all love him and competing against each other.  

Similarities - Both MCs are contract killers/assassins - Both MCs have a harem - Both MCs don't have emotion (in the past life) - Both MCs have experience in close quarters combat and firearms - Both MCs use snipers - Both MCs have no emotion and are treated like tools Differences - MC in Grisaia doesn't die and reincarnate - MC in Sekai doesn't have army backgrounds - Sekai world is in fantasy world - Grisaia is in modern Japanese world 

If you like an anime in which the protagonist is fucking and cold as the grisaia you should watch this anime 

Both of the these shows have a really cool protagonist that takes place in a high school. Also both protagonists have previous military experience which allows them to make decisions and have ideas that are outside the social norms. Both also make calm, calculated judgements using previous ideas and experiences mentioned earlier in the anime. On top of that, you can rewatch these anime and pick up on things you missed earlier. I personally like each of them because of the unorthodox solutions that the characters come up with in order to solve difficult problems. 

Both involves one guy in a school with lots of girls, except one was more of action, mystery and romance while the other was more of comedy, Both can also be classified as the purest of harem in a general sense.  

The military sections are very similar in tone and feel, heavily incorporating emotional backstories to build up to present day events. Also centres around a strong female character that makes a powerful impression on a younger male. The harem aspects might differentiate Eden of Grisaia, but both shows feel grounded in the values of a slick, contemporary thriller. 

If you like action anime with great surprise, I recommend this. - Both MC are typically strong, but it was shown in the latter. (well kazami yuuji has a good start, because it was shown in the beginning that he is a elite ex-hitman before.) - Both antagonist is super strong (I'm basically saying in owari no seraph, progenitors are deemed to be a strong foe that can't be beaten alone no matter what you do. while grisaia's strong antagonist are only the leader and the fake kazami.  

After you watched episode 5, you will have a feeling that they look similar. - Organization - Interesting storyline - Both MC trained to become a soldier / guardian before they become a professional hitman / killer / spy. 

Similarities: Both of the MCs have hidden, tragic pasts that turn them into cold, calculated, and close to emotionless badasses. Thus, both the MCs are very strong. Similar harem type concept in both hows with the girls in the harems also being special in more psychological terms. Very similar art style and production, had to even check if they were made by the same studio. Very similar twisted side of human nature shown in both shows, the distinct and powerful Grisaia type art is used in both. Differences: Youkoso is less fucked up and psychologically demented and ugly overall, at least by ep 7, Grisaia definitely takes that aspect farther. Also no incest in Youkoso so far, unless imouto ends up getting raped by seitokaicho or some tragic past of hers is revealed.  read more 

They both are harem anime They both have great female characters who are waifu material. They both have MCs with long hair. Both animes made me wanna kill myself.