Sensitive as Ushio is, especially when it comes to mother figures, he remains emotionally drained and doubtful of his own strength in the wake of the loss of Oyakume. Logical arguments like it was her choice, and perhaps she was always meant only to live long enough to protect Ushio there and then against the minion of Hakumen, won’t dissuade him from his spiral of despair.
As for Tora, he gets sick of this attitude real fast, and tries to snap Ushio out of his funk by threatening to kill and eat him in his weakened state. Ushio listlessly fights back, causing Tora to conclude he’s far too weak to be worth eating, so he’s peace-ing out until he is.
Ushio and Tora may have become near-as-makes-no-difference friends, but Tora’s not the hand-holding, comforting kinda friend; he’ll split if things get whiny and boring. After all, Ushio’s weakness uncomfortably reminds Tora of just how strange an tenuous a relationship they have, which makes him question his own strength in terms of being a Big Bad Monster.
Conveniently, Tora’s absence leaves Ushio open to a confrontation with Kirio and a group of ten Kouhamei monks who steal the Beast Spear, intending to destroy it in favor of Elzaar Scythes, the “superior” holy weapons.
Meanwhile, Kouhamei sect members who haven’t fallen in with Kirio—Nagare and Hinowa—both act to support Ushio. Tora hooks up with Nagare, who at the moment is more interesting than Ushio, while Hinowa’s loyalty to the high priest and late Oyakume won’t allow her to let Ushio or the Beast Spear be destroyed.
Hinowa and Ushio get an education on the Inasa, a former sect member who raised Kirio. Driven by his fear for Hakumen, he grew so obsessed with developing weapons that he started to believe he could make one better than the Beast Spear, using a forbidden combo of sorcery and science that got him excommunicated. He took up residence in the “House of Whisperers,” which is where Nagare and Tora begin their search for Kirio and the Spear.
What we basically have, then, are two very common genre concepts—mad scientist and his haunted mansion—cloaked in an Ushio to Tora skin. Which is fine; again, we knew he’d have to contend with one more would-be successor (albeit one who wants to destroy, not wield the spear), it’s just that Ushio’s crisis of confidence feels like a rehash, and we’re with Tora when he says a weak Ushio is a boring one.
Nagare and Hinowa, on the other hand, are their usual delightful selves, with the former offering Tora some interesting insights about his life, (seeking a life of excitement while stopping short of putting his own life on the line for others), while the latter is constantly scolding Ushio for his lack of manners and propriety, but not hesitating to help him, because she believes he’s the true wielder.
Then there’s Towako, a woman who comes out of nowhere to help Inasa advance his research and perfect Elzaar scythes. Another evil crazy-eyed character? Sure, why not?
Towako seems like some kind of dark muse for Inasa, until she steals an infant and decides they’ll use it to create the “materia”, the ultimate artificial spiritual warrior who will wield the Elzaar Scythe, and along with Kuin take out Hakumen no Mono. They share the desired end with Kouhamei Sect, but it’s the means that are so, so wrong, to the point that even Inasa isn’t really fully on board with creating Kirio, though he’s not strong enough to step in and stop it.
Inasa ended up dying in that house, while Towako is still around somewhere, having raised and twisted Kirio into her instrument. But you know what? Despite learning that Kirio had a rough upbringing and probably suffered much at the hands of people who were, charitably, on the cusp of insanity, the bottom line is I still don’t much like Kirio.
Revealing him as a GMO Monster that can only act as programmed doesn’t make him any more sympathetic or compelling a character. He’s literally a tool, and an obstacle to Ushio, and whether he’s killed or joins the cause, I’d prefer if he was dealt with sooner rather than later.