I finished "Framed Thief" Quest and I can't start the Second Attack after the Jenny CG scene, is there requirements to start? I didn't see anything required on the walkthrough video or the handbook.
After the initial events about Moriko and the thieves guild, which start at the Aldlyn city board after you constructed the police HQ and upgraded it, talk with Flaire to further advance her events. Once her and Sandra's events are far enough, you can get an event with Sandra and Jenny at the casino in Newkungu. Afterwards you have to return to Flaire to get the quest about helping Jenny.
When that event is also done, and you're either on Moriko's good path or you had her 2nd sex scene on her bad path, and you advanced the main events to the point where Commander Walcot gave you the access permit for the Dhranholl mine, you can talk with Flaire to start the second raid on the assassin guild.
[ https://renryuu.miraheze.org/wiki/FAQ#Thremten_thieves_guild_second_attack ]