|Episode 10 - Poison and the Curse|
Riko is excited to go through the 4th layer, but Regu is worried about the effects of the curse down here being much stronger than the 3rd layer. It's extremely unlikely for Riko to survive ascending from here.
While they're hiding in a small cave and talking, Regu senses some creature that is listening to them and moving around whenever they talk. Then they try to go somewhere else, and as they're walking through the foggy swamp, they encounter a big creature that Riko says Regu doesn't stand a chance of fighting against. The only thing they can do is retreat... and again they forget that they have the Blaze Reaper with them until it's too late and the creature makes them drop it and it sinks into the swamp... Then Regu tries to block an attack with a metal umbrella, but the attack pierces right through it and injures Riko's hand, both injuring and poisoning her.
Regu realizes that using his incinerator in this situation would leave Riko in great danger, and the only way they can escape is by ascending to the top of one of the mushroom things.
Prediction: The curse makes Riko bleed out all of her poison and that's how she's able to survive.
Yep, that's exactly what happens... but now how will she survive the affects of the curse itself? omg this part is so gross... oh and the poison already made her hand swell up and she uses all her strength to tell Regu to cut it off.
I actually thought she was legit done for at this part... but then some rabbit girl shows up out of nowhere, and instructs Regu on how to perform CPR to save her from dying. This rabbit girl has been shown in the ending song since the beginning but only now joins the story. She must've been the person that Regu sensed earlier.
This person takes Regu to her home, grassy hollow where the curse doesn't reach, and says she has a way to fix Riko's arm. The episode ends just as she introduces herself. She's a hollow named Nanachi.