If you want to play a High School DxD game, your best bet is to find a or PS Vita (and the physical game cartridges, as digital stores are closed for those systems).
It sounds like you're asking about on the PSP (PlayStation Portable). High School Dxd Psp
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"At the end of the day though, it's just a really nice car that doesn't make people
feel bad about how nice it is."