If you read other works by the author, you will find the same melancholic feeling here. In the first half of the series, the characters are on the one hand kinda puppets to have philosophical debates (which I liked, dont misunderstand) and on the other hand broken people who try to interact and carefully build mutual ground together in the gaming club, where they all find a place to hide from real life. The second half is basically "komm süßer tod": It all comes tumbling down down down. Now that I think about it, Evangelion isn't so different from this manga. You know, without the angels, mech fights and the happy ending.