A Persona 5 Sunless Skies crossover. This site doesn't have Sunless Skies as a fandom. Also posted on Ao3. The worst soul, the very worst soul that has ever stepped across the threshold, now put on display in Carillon, a tour of seven segments, each presenting a flaw.

"Captain's log - Date: 16th August, 1943 - A mutiny occured on my vessel. But that wasn't the worrying part. The more worrisome part was that I was back on the surface. Furthermore, my vessel crashed. Inoperable, for the time being. The date has shifted almost a century... How old would I be considered?" (Sunless Skies captain lost in Gensokyo!)

Experiencing an era of relative peace, Falmart continued to be, never changing, but never progressing, either. Chained by Gods to eternal stagnation, it could only continue living as it always did, under the watchful eye of the divine beings. But a hateful Sun started shining, and its tendrils began taking root. Time itself was at its will, and few knew the horrors that came.

The Neath changes. The Neath welcomes. The Neath gives opportunities to the willful and crafty and unscrupulous. This is the story of Iori Sei - and the story of the Neath and its gallivanting with the Gunpla culture. And, of course, as is all things in the Neath, what lies beyond the surface: "Field Sixteen. Sunless Sea."

(No previous knowledge of Sunless Sea required). The Spartoi crew end up in an underground sea, devoid of Sun and logic. This is their eldritch adventure of returning home. (The air is filled with Salt. A Fake Sun plots while an eaten corpse cackles. Golden eyes are everywhere.) The Unterzee harbors many secrets and none of them are pleasant.

Dry Bowser explores the Zee as he wonders how it's possible to see within an ocean without a sun shining on it.

This story is about the manager of an inn in Japan being brought down to London and his adventures and actions in both Fallen London and travels on the Unter forr better or worse as he deals with the terrors and trials of the Unterzee.