In the Sket Dance franchise, both Himeko and her friend, Arisa (A-chan), had the same brand of a field hockey stick with the name Valkyrie.
In Himeko's flashback, she meets Arisa Kanou who had the same hockey stick as her during hockey practice. The two become friends quickly. However, their friendship is tear down asunder when Hime learns that Arisa has Kyoko Nanba as her bodyguard to protect Arisa's peaceful life at school. Hime uses Valkyrie to defeat Nanba and her delinquent friends. Later, Hime transfers to Kaimei High School where she encounters Bossun and Chiaki. When Chiaki is troubled by some thugs, Hime protects her and breaks her Valkyrie hockey stick in the process. In the end, Bossun helps Hime.
The successor of the Valkyrie hockey stick is Himeko's Cyclone.