What is "w-b-x"

"W-B-X (W-Boiled Extreme)" (stylized as "W-B-X ～W-Boiled Extreme～") is the eleventh single by Japanese musical artist Aya Kamiki and the first as a collaboration with TAKUYA, former guitarist of Judy and Mary, as . The song is Kamiki's first release under the Avex Trax label and is used as the opening theme for Kamen Rider W. It is also a single from her first album released under Avex titled Individual Emotion.