Thread:Halo1081/@comment-25993554-20150305165550

Mostly flashback chapter:

"Kayano is working as a child actress while her sister was both teaching in Class E and doing the tentacle research, a explosion happened and Kaede found a bottle with a black substance on the site where the facility was, the rest is basically the same you heard about her injecting the tentacles on her neck and breaking the trophy on purpose and getting sent to class E, she dyes her hair and meets Nagisa for the first time. The chapter ends with her sending a challenge message to Korosensei to meet him at a certain place and time in order to assassinate him"

I'll tell you anything else I find. 