The Spread Shot of Chiyari Tenkajin (a Touhou LW original). She sucks corrupted blood in this attack. The Former Hell of Blood Pools lies in the abandoned Former Hell. It was once sent into an uproar by the arrival of Yuuma Toutetsu, who had come to live there. It seems at that point, Chiyari was already living there. That means she must've been present during the event where oil sprung up to the surface.

The Focus Shot of Chiyari Tenkajin (a Touhou LW original). She attacks with despised tenka (a kind of will-o'-the-wisp or onibi). Originally, Chiyari lived in Hell and survived off of the blood pools. This means that, unlike the youkai who were forcibly sent to the Underworld, she was either born there (which may also be true for the Hell raven and kasha) or moved there voluntarily. It seems that during her time living by the blood pools, she's lost all interest in the surface world, so perhaps it's the latter that's true.

A Spell Card of Chiyari Tenkajin. This attack resembles that of a cursed bloodsucking youkai. Chiyari only ever met Yuuma because of Zanmu Nippaku. Chiyari and Zanmu have long been friends, and it's likely they've known each other since at least the time when Former Hell was separated from Hell. Of the three spies, it's fair to say Chiyari's ties to Zanmu are the strongest.

A Spell Card of Chiyari Tenkajin (a Touhou LW original). This attack resembles an inferno of cursed blood. It seems Chiyari has little interest in involving herself with the world's uproars and disturbances. That was true during the incident where hordes of phantoms were released on the surface and was likely true when Former Hell was separated from Hell. Drinking from blood pools is all the fun she needs. She and Yuuma are alike in the way they prefer to observe situations without interfering. Perhaps that's why they get along.

The Last Word of Chiyari Tenkajin (a Touhou LW original). She recalls her territory in this attack. Former Hell is a land that was discarded, and the one who discarded it was the human oni, Zanmu. It's strange to think that there's a connection between her and Chiyari, who remained in the (now Former) Hell of Blood Pools. But Chiyari knew full well that resentment was the defining trait of all youkai. Without resentment, they can't survive. Without resentment, there'd be no meaning for their existence. Zanmu discarded Former Hell without hesitation, which filled the empty hearts of the youkai denizens with resentment. In a way, what Zanmu did was an act of heroism, providing salvation to the Former Hell youkai, who had found a new enemy to resent. For Chiyari, this meant she not only had her leisurely lifestyle with Yuuma to enjoy but also her delectable new resentment for Zanmu.