reserch

1 Tokyo Ghoul

http://www.amazon.com/Animation-Tokyo-Ghoul-Vol-1-TCED-2340/dp/B00LGK08QE

I have learned a lot about Tokyo Ghoul the secret is that Ken is a ghoul and is hiding his secret from his best mate and that I am currently watching season 2.

2 Final Fantasy XIII Lightning Returns

https://theinsightfulpanda.files.wordpress.com/2014/04/lr_ffxiii_bhunivelze_battle.jpg

There are secrets in Final Fantasy XIII Lightning Returns 

because Bhunivelze is hiding a secret that he has made Lightning a god of death without her knowledge about it and that he can not bring her sister back. 

3 Sword Art Online

https://theglorioblog.files.wordpress.com/2012/12/horriblesubs-sword-art-online-23-720p-mkv_snapshot_09-16_2012-12-10_12-50-38.jpg

The secret in this anime is that  Sugu  has a crush on her brother and then she falls in love with Kazato avatar in Alf Hiem Online and finds out it is Kazato.
4
Bleach

http://www.bleachdatabase.com/images/db/2010/07/953.jpg?1279573813

The secret is that Ichigo has a Hollowfocation and it is not permitted in the soul society or as a soul reaper. 

5

Hollyoaks

http://www.unrealitytv.co.uk/wp-content/uploads/2015/06/hollyoaks-gloved-hand-killer-7-460x257.jpg

The secret is that there is a killer in Hollyoaks who is killing people off in the hospital. 

6