User blog comment:B214/Volume 17 spoilers./@comment-1359322-20140224074737/@comment-80.117.31.24-20140225003536

Rossweisse in just one Volume falls in love with Issei, makes him pretend to be her boyfriend and has a date with him. Now i understand why she is considered a "genius".XD Now she would be in top 5 of "issei lovers", it's a SUPER jump.XD