[3] Between the release of Koda Kumi's studio album Kingdom and the first day of the concert, Koda Kumi had fear and anxiety over performing on stage after her statement on All Night Nippon on 31 January of that year.

On that date, she had made a lighthearted comment after being asked by the radio host her opinion on her manager getting married and the prospect of having children.

Kumi had responded, "When women turn 35, their amniotic fluid goes rotten, so I hope they have a child before then.

"[4] The comment caused immediate backlash due to the low pregnancy rates in Japan and the sensitivity of the subject among Japanese women.

Kumi had made a public apology on FNN Supernews, saying how she deeply regretted hurting thousands of Japanese women and mothers.