Kaku-San-Sei Million Arthur, the alternate Arthurian legend card game hit that started a franchise, moved from smartphones to Vita. In addition to full voice acting, the Vita version has crossovers like this one for Senran Kagura: Shinovi Versus.
Now, Kaku-San Sei Million Arthur has cameo characters from Arc System Works’ BlazBlue series. Players will be able to get crossover cards and play a crossover event until June 9.
Square Enix and Arc System Works worked together before when Noel crossed into Lord of Vermilion Re: 2. Why do crossovers like this happen? One likely possibility is Arc System Works recently released BlazBlue: Chrono Phantasma on PlayStation Vita and this is a way to get their characters in front of their target audience.