Children’s Day

Children’s Day is a public holiday on May 5 that Kyoichiro Kaga proposes as a possible date in his investigation of a recurring bridge-name clue. Its significance remains provisional: he has a hunch that the date may matter, but cannot establish a connection between the holiday and the bridge in question.

A Date Considered in the Investigation

Kaga and Shuhei Matsumiya are tracing a list of bridge names that corresponds to the months of the year and to entries on Mutsuo Koshikawa’s calendar. Kaga reasons that when the calendar turned from April to May, Koshikawa might have seen Ichikokubashi Bridge listed for May and understood it as a reminder to go there during that month.

Asked which day in May the reminder might indicate, Kaga says he does not know. He offers May 5 because it is Children’s Day and a public holiday, but stresses that he has found no link between the holiday and Ichikokubashi Bridge. He also rejects Constitution Memorial Day on May 3 as an explanation.

Evidentiary Limits

Children’s Day is therefore a hypothesis in the detectives’ attempt to interpret the calendar, not an established appointment or motive. The distinction matters: the matching month and bridge name support the possibility that Koshikawa read the calendar as a prompt, while the specific date remains unverified. As the detectives move on from Ichikokubashi Bridge toward Nishigashibashi Bridge, the investigation has no confirmed holiday-based explanation for the May entry.