[Sushi-Y]

[Onikakushi-hen's piece is required]

Spoiler:

This piece meant something very important to us.

Because it has shown us, for the very first time, that it was possible to poke a hole within June of 1983, which I had given up on as an inevitable fate.

To start from the conclusion, everything was taken in by Rule Y in the end, and the whole thing went to waste.

But, we challanged the great law that governed this game board, Rule X, head on... and proved that we could defeat it by making good use of the knowledges we have learned from the other pieces up to this point.
By learning, we can grow.
In a game with no hopes of winning, we can discover a slight chance of victory.

This was the piece which has taught us that....

With this piece, Rule X was completely shattered.
Maebara Keiichi and the others will no longer be lead astray by something pathetic like the Hinamizawa Syndrome, and dance in a tragedy anymore....

It has also taught us that a Rule is not an invincible existence, but something that can be defeated.
In other words, it has also given those of us who are outside the game board a sense of hope.

...This is an important piece which became the cue for everything, as well as the game's turning point....