You can equip various "MMS" (Multi Moveable System) parts, including melee weapons, firearms, and specialized armor that grants unique "Rail Actions" (powerful special moves).

Winning tournament battles and completing "Love Events" increases your Shinki’s rank and unlocks new equipment in the shop. Mk.2 Enhancements

JP PSN on PSP/Vita → expired store.

Have you managed to unlock Ach & Yda on your playthrough? Share your garage setup in the comments below.

If you owned a PS Vita or PSP Go in 2012, you could download the DLC via the old Media Go software. Those devices, if never formatted, still have the data. Transferring that data to a new memory card is the only "pure" way to play the full game today—outside of emulation.