Sorry, I have no idea what the song name is. If anyone knows, please leave a comment and i'll update the description.

How it's similar to 11 Eyes:

One guy and girls with powers and/or guns fighting in a different world.

How it's similar to Kyoukai no Kanata:

Both about fighting in order to survive or be safe. Both are very touching story with little bit of romance. Both story surely make you feel like wanna cry. Both has a very nice and touching song that surely make you fall for it. Both are about teamwork and friendship. Both story shows that everyone has their own past that has been kept secret all the way. Both stories shows the sadness and the difficulty when departing with your friends or someone you treasure the most. Both of the main characters met up in the end of the story. Both have a peaceful ending and all the character continue to live their own normal usual life.

How it's similar to AnoHana:

Both have as main a silver haired girl that has a goal to fulfil. Both animes talk about death, life and reincarnation. Both are about a group of friends that go through many situations but in the end show us that true friendship is a wonderful thing. Both will make you teary.  

How it's similar to Kokoro Connect:

Comedy and funny moments are superficial in addition to profound themes and meanings. With the inclusion of a love interest and tragedy.

How it's similar to Plastic Memories:

Both have a kuudere loli who isn't a normal person. Both have a male lead who is a newbie and a nice guy. Both have a certain organization the main characters are a part of. Both have certain supernatural/sci-fi elements. Both have a sort of way to "not exist" that isn't really dying (Plamemo has "retrievals" and Angel Beats has "disappearing.") Lastly, both have tearjerkers .

How it's similar to Shigatsu wa Kimi no uso:

One thing is for certain; at the end of these two anime, you will need a new box of tissues. They both focus around the lives of two people, brought together by similar situations. They learn from each other and ultimately bring the stories to life, through their trials and tribulations. Similar themes of tragedy and music exist in both shows.

How it's similar to Clannad:

Drama has similar fell and has same over the top comedy relieves. Both has great animation and music has been done by same composer. 

How it's similar to Grisaia no Kajitsu:

Seems like they're at a school type of setting trying to get over s