A friend of Walker Yumasaki. She is a very passionate otaku and manga reader.
Erika Karisawa was born in Ikebukuro and is a massive otaku. She is often seen in various bookstores and shops with her friend Walker Yumasaki buying new books and making references to previous works of manga and anime. Aside from spending time with Walker, she also hangs out with Kyohei Kadota and Saburo Togusa as they are members of the same group. Erika, like with her other friends, were once members of the Blue Squares but left during an incident that occurred with the Yellow Scarves. After her run with that gang, she became a member of the Dollars and is a huge promoter of it, doing whatever their leader asks of them.