Sou releases his fifth album. In addition to tie-in songs such as "Bakeso na Kokoro," the second cour opening theme of the TV anime "A Terrified Teacher at Ghoul School!," and "Tada, Kimi no Mama de," the ending theme of the TV anime "Zenshu." whose music video has surpassed two million views on YouTube, the album includes digital tracks produced by singer-songwriter mekakushe and the rock band Oishikuru Melonpan. It also features the new song "Q.E.D," selected as the opening theme of the TV anime "The Case Book of Arne," which begins airing in January 2026, along with six newly recorded songs created with notable creators. The Regular Edition includes a bonus track in addition to the common tracks