Has an NPB (Japan) game ever ended 23-4?

Exactly once. On July 18, 1978, Hankyu Braves beat Lotte Orions 23-4, and no NPB (Japan) game before or since has ended that way. When it happened it was a scorigami, the first 23-4 in league history.

Where 23-4 sits among nearby NPB (Japan) scores. Deeper blue means a score has happened more often; the outlined cell is the new one.

That makes 23-4 the 191st most common final score out of 223 that have ever occurred in NPB (Japan). One point away, 24-4 has happened never and 23-5 has happened never.

Every 23-4 in NPB (Japan) history

Date	Result	Season
1978-07-18	Hankyu Braves over Lotte Orions	1978

Open the NPB (Japan) grid at 23-4