Playing and struggling to understand the appeal. All girls have the exact same body, combat feels limited, I am failing to understand why you won't always activate nekkid mode with infinite square combo, as there is no obvious downside, or why Fusion Arial thingie does not always work or anything in fact.
You have to play the three combat modes to level up your moves. It's kind of a bit of a hassle to grind out battles just to unlock more moves for the character you like. But you'll gain more options.
Flash mode is your options Pre-transformation, so you're limited in your move set however you have more defense (more clothes) however you can only follow up an arial rave once. The more you level up your character the more options you have in the air depending on your character. (Dashing during combo strings also affects the next attack depending on your move list) so you can still follow up on the air after an arial combo with air dashes.
Yang mode is after the shinobi transformation, you have access to more of the movelist with a higher damage and your ninja arts. usually you should activate it to get through trash mobs in a speedy time or save it for bosses when you need the health regen. You can interrupt any of your regular attacks with a ninja art on the ground so dont be afraid to just throw it out if you feel you can go for the kill. You're also completely invincible. The higher level in yang mode, the more arial raves you can do.
Yin mode means you have very little defense, you have access to faster more damaging attacks in exchange for very little defense (no clothes) and you'll take twice as much damage. Same as above, the more you level, the more arial raves you can do.
Each mode has to be leveled up sepreatly by use, so the more you play one mode the more it will improve.
Playing missions on easy with Yin mode is a cakewalk, but you'll be hardpressed to stay alive on Hard against the bigger enemies and bosses solely by mashing buttons all day.
Also, you can block...its there, nobody uses it but it's there and it will save you, especially when you know how to parry correctly. Even on hard, learning to parry the boss can make the game much much easier.