Shirane acts condescending towards Kazuya and Kiriha when the two fail to notice Shirane's presence and later stating that the two would not normally be granted an audience with Kukuri of Shirahagi. She is shown to get embarrassed when Kiriha wrestles her in the baths and when Kukuri tells her that Kazuya had been restraining his strength in all their prior encounters. Kukuri of Shirihagi states Shirane has little experience with the outside world.
After Kazuya and Kiriha meet with Kokuyou at the Ookane Shirahagi Shrine, Shirane arrives to escort the three to meet with Kukuri of Shirahagi. Kukuri punishes Kazuya and Kiriha for harassing her earlier, before bringing the group to where the body of the Kukuri of Kamioka is being held. After explaining the situation, Kukuri unveils her plan to have Kazuya and Kiriha to enter Yomi to retrieve their Kukuri's soul. The two agree but Shirane interjects, stating the plan is of great risk to her master. Shirane brandishes a blade and challenges the two to a duel for them to prove themselves capable of succeeding with Kukuri's plan.
As the two duel, Kazuya proves capable of handling most of Shirane's attacks. Shirane decides to unleash a powerful attack but their battle is cut short by Kukuri who encases both combatants in water. Shirane expresses confidence that their duel proved her argument about Kazuya's inability to carry Kukuri's plan, but Kukuri decides the opposite to Shirane's surprise. Kukuri tells Kazuya he is to depart for Yomi immediately and that Shirane is to serve as their guide. Shirane protests, expressing concerns about Kukuri's safety in her absence. Kukuri dismisses Shirane's concerns and she reluctantly agrees. While Kukuri makes preparation for their journey to Yomi, she tells Shirane to join Kazuya and his friends in the bath in order to deepen their bonds.
Shirane enters the bath where she finds Kiriha chastising Kazuya for allowing Shirane to overpower Kazuya during their battle, to which Shirane tells Kiriha to stop being a sore loser. Kiriha suggests Shirane has arrived to apologize to them but Shirane explains she is there strictly on Kukuri's orders to bond with them. Kiriha takes Shirane up on the offer and attempts to unleash her obi but fails, which Shirane explains as being a restriction of the Shrine's bathhouse. Shirane expresses her irritation at Kazuya and Kiriha bathing together and tells Kazuya not to look at her. While washing themselves, Shirane continues to express her disapproval of Kazuya and Kiriha despite Kukuri's choice. Kiriha admonishes Shirane for her arrogance and grabs Shirane from the legs under, lifting her up and exposing her crotch to Kazuya and Kokuyou. Shirane demands that Kiriha release her but Kiriha states they are simply deepening their bonds as Kukuri told her to, causing Shirane to grow more flustered. Kiriha pushes Shirane to the ground and washes her while Shirane yells for her to stop. Kazuya's other tsugumomo partners join the bath and after their confrontation with Kokuyou, they hear Shirane's screams after she is konchoed by Kiriha. Kazuya attempts to stop Kiriha but she goes in for a second strike. Shirane regains consciousness to find Kiriha restraining her by the legs and witnessing Kazuya using Internal Spiritual Power Manipulation to heal Kyouka's anus. Kiriha tells Shirane Kazuya will heal her as well. Though Shirane initially refuses, Kiriha restrains and convinces Shirane to undergo the treatment.
Returning to Kukuri, she asks Shirane if their bonds had deepened, to which Shirane hesitantly affirms. Shirane restates her doubts about Kazuya and Kiriha's capability of carrying out the mission. Kukuri dismisses her concerns once again and explains that Kazuya has been restraining his strength in all of their encounters, causing Shirane to grow embarrassed. Kukuri restates her order to guide them to yomi, reminding her she is not allowed to object. Shirane accepts and bows before leaving. The next day, Shirane and Kazuya's party are dressed in Kamui in preparation for their departure. Kukuri explains to them how their journey will go, explaining the rules and telling them to ask Shirane for further questions during their journey. Kokuyou expresses her desire to join them but Shirane reminds her she is not strong enough. Kukuri transports the group to the Yomi Slope where they undergo Final Water Sending Ritual to become half-dead. Before sending them on their way, Kukuri performs a water divination to assess the dangers ahead, predicting small misfortune.
Shirane explains the various inspections they will undergo as they travel down the Yomi Slope. At the first inspection, the examination of food regrets, they are stripped naked and walk through a hallway of food. Their group arouses suspicion from the guards when Kiriha's stomach growls and she reaches towards a large serving of pudding. They forced to undergo the second inspections, the examination of lustful regrets, which Shirane wishes they could have avoided. During the inspection, Shirane is deceived by an illusion causing her to believe that they have already failed the test and were sent back. In the illusion, Shirane speaks with Shirahagi who comforts her sexually, causing Shirane to grow a penis. The illusion is interrupted the by Kyouka and Kiriha who rescue Shirane before she goes too far. Shirane is astonished when Kyouka tells her that she is the only one who fell for the illusion and thanks Kazuya for saving them. At the final inspection they pass Chigaeshi no Ookami and witness him repel an invader attempting to force their way into Yomi. Shirane mentions Chigaeshi's left hand was rumored to have been cut off by a lone girl which Kiriha is doubtful of.
Passing Chigaeshi and venturing through the Iwatsubo Tunnel, Shirane tells the group to stop and rest. While Kazuya and Kiriha initially reject the idea, Shinobu has Shirane affirm that it will not delay their schedule. Shirane insults the two for believing they could carelessly charge ahead, annoying Kiriha. Shinobu agrees with Shirane and Kazuya sets Mimane down in a hidden area for them to enter her mirror world where Mimane has a house awaiting them. While resting, Shirane thinks back to the illusion while touching herself. While eating, Shirane re-explains to Kyouka the rules of eating food from Yomi. While the other girls take a bath together, Shirane reminisces about the illusion some more, feeling ashamed for being the only one to fall for it. Shirane catches Kazuya washing the dishes alone and gets a glass of water. She asks Kazuya if he is still thinking about the earlier illusions, surprising Kazuya to how she would know. Shirane points out his erection as evidence but expresses relief knowing she was not the only one affected by the illusion.
The following morning, Shirane has Kazuya gather up his tsukumogami before continuing in order to avoid attention. Kiriha and Mimane stay outside while the other three reenter the mirror. Reaching Yomi, the group gather with the other souls listening to a speech by the Yomi guard. The guard is interrupted by Kamuado and her Yomi True Phoenicies. Shirane suggest they escape quickly as the bandits incapacitate the guards and begin kidnapping people. Kazuya equips Kiriha and begins rescuing them despite Shirane telling him not to get involved. Mimane is kidnapped and they retreat forcing Shirane and Kazuya to give chase. Shirane berates Kazuya but states they are heading towards their destination anyways. She tells Kazuya not to underestimate them but states they should not be too much trouble and quick to defeat. Kazuya destroys the binding on Mimane, allowing her to release Kyouka, Shinobu and Sosogu to fight. Before Kazuya can recover Mimane, Kamuado snatches her away. Kamuado challenges Kazuya to duel Taunade for Mimane's return, otherwise being forced to join her should they fail. Shirane rationalizes Kamuado is not the type to lie and accepts the challenge on Kazuya's behalf, telling him to defeat her quickly.
- Hundred Split (
百分裂, Hyabunretsu): Shirane creates numerous copies of her shorts swords that fly through the air and act as projectiles. Each of them are covered in an immense amount of spiritual power, making it difficult to deflect all of them.