然後，是星期一……

Missing, extremely new, or very obvious to obtain.

"Embryo of Philosophy" Sunday's ability, Im Anfang war die Tat, is a German phrase often attributed to Johann Wolfgang von Goethe and appears in his play "Faust," specifically in "Faust: Part I." It translates to "In the beginning was the deed/act" which contrasts with the biblical "In the beginning was the Word" from the Gospel of John. The phrase from the Bible alludes to the view that emphasizes the importance of actions in the creation and transformation of the world. Sunday takes 7 turns to charge up the ability, while God created the world in 7 days. "And Then It Is Monday..." alludes to the first Monday after the 7 days of creation, which also alludes to Sunday's [8th] turn, which releases his ability.