Pretty Simple there are 2 New Events arround Shuya the first 1 where you meat 4 new Girls which sit arround a Table with Shuya and talk about somethink.... These 4 are pretty sure the 4 new conquerable girls in a later patch... Vivien however is Part of the second Shuya event after the first one.... I dont want to spoil more but there is your light on the subject