In Danganronpa, how can a classroom trial be called if there are only 2 witnesses available? Unlike the games in Liar Game, the rules of a Danganronpa game are sometimes made up or stated midway, which for me kind of sucks but is tolerable so long as the rules are consistent.
In Liar Game, afaik, the dealers have always accounted for all possible situations so whenever there are changes in the game, they state it outright. For example, in games involving voting, the dealers have stated what happens in the event of a draw.

Suppose in a Danganronpa game starting with 15 students,

all murders are committed by exactly one person (no collaborative murders during the act, but before or after the act is fine, assuming there would be some incentive) and to exactly one person (no multiple victims)

all murderers are successfully guessed and convicted (iirc, this is by majority vote) so long as there are more than 3 players

No one dies in a way other than being murdered. So, no one messes with Monokuma, dies of an accident, dies of health conditions (eg asthma) or naturally (eg old age), etc, but suicide is fine.

No murders will be hidden from the other students indefinitely, as in all corpses will be discovered or if the body is burned, then there will be enough evidence to say a murder has taken place and thus enough evidence for a classroom trial to be called.


Assuming the above situation is consistent internally and consistent with the initial set up of a Danganronpa game, such game will eventually come down to 3 students, whom I'm going to call Kotonoha, Yuno and Mion.
Assuming the game continues (so it's not declared a draw between the 3) and Yuno dies, then only Kotonoha and Mion will be able to see Yuno's corpse, if there would be one. So assuming there is a corpse (body is not burned or anything), and it is discovered, or there is no corpse, and the death is discovered in another way, how can a classroom trial be called?
Perhaps Monokuma will adjust the rules, and a classroom trial will be called anyway, but I would like to know what are the stated rules regarding this, if any, and from any media.

If I made any logical errors either internally (inconsistent with itself) or externally (inconsistent with Danganronpa), please point them out.
PS I'm done with the anime. Go ahead and spoil other media. But please use spoiler tags for others.
PPS Re 'Kotonoha, Yuno and Mion'

 Don't spoil please re 'Mion'.
Danganronpa V3 addresses this
Note: I am putting it as a spoiler even though it is presented to you before the first chapter.
In the most recent game, DRV3, A school regulation is created by Monokuma. stating:

 #6: If innocent students (hereinafter referred to as &quot;the spotless&quot;) continue to survive the class trials, the killing game will continue until only two students remain.

From this regulation, it seems the game will end immediately when only two students are alive. In the situation you presented, one of the final two will be the blackened. However, the regulation states &quot;two students&quot;, not &quot;two spotless students&quot;. This means that the game will end with two students, regardless of their blackened status.