There are gameplay differences on each DMC1 release. For PS2:
Changing HD Collection 2018 text to JP text does save a little time over ENG.
There are four different types of difficulty. For this game, the most significant ones are Easy and Dante Must Die.
Each attack has a value of additional red orbs. Every time an attack is landed, you will get additional number of orbs accumulates on said enemy. When enemy is killed, the number of red orbs that will appear are:
The basic value (number is dependent on enemy) + additional number of orbs that is accumulated in that enemy.
The important thing to note is that as the combo rank goes up, the number of additional orbs will be doubled or even tripled, and the final number of red orbs that will appear increase accordingly. Even if the combo is interrupted the accumulation value on each enemy will be maintained and will not go to waste. In Short:
Now let's calculate number of Red Orbs drop by using this following sequence with Ifrit assuming some moves 3 are charged for 48/60 frames per second or more:
Magma Drive → Straight 3 → Body 3 → High Kick → Lotus Drop 3