[Guide] Onimusha 2: How to Use all 4 Characters in One Playthrough and Get 65% Scenario

In Onimusha 2 Samurai's Destiny there's a second ranking system consists of 4 sub-ranks and they're as follows:

Speed sub-rank: clearing the game in less 4 hrs.
Skill sub-rank: 40% or more of enemies are killed with successive Issen hit.
No-Save sub-rank: no saving at all during the game.
Friend sub-rank: all 4 sub-characters (Kotaro, Ekei, Magoichi, Oyu) must be involved in control in the game progress.

i decided to make this video because it's kinda hard to use all of the 4 sub-characters in one playthrough.

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One of the requirements to get an S Rank in Onimusha 2 is "Scenario Percentage":
65% or more:10 points.
60% to 64 %: 7 points.
55% to 59%: 5 points.
54% or less: 3 points.
and the best way to get 65% or more is simply to use all the sub-characters in one playthrough.