Monogatari Series: Second Season episodes

On New Year's Day, Kaiki receives a call from Hitagi requesting for his services. After claiming that he is in Okinawa in an attempt to shake her off, Hitagi affirms that she will take a flight to meet him there, forcing him to do the same to keep his lie from being exposed and Hitagi from killing him. Once meeting at the airport, Hitagi explains their problem with Nadeko - she wants him to deceive her into letting them live as the day of their graduation and battle with her approaches. Despite seeing how Hitagi is desperate enough to resort to asking a man she loathes and that she is prepared to attend whatever demand he asks, Kaiki claims that he has no reason to help them at all before considering their connection with Gaen's niece Suruga, causing him to accept Hitagi's request.

Kaiki decides to help Hitagi for a mere ¥100,000, much to her surprise. They leave Okinawa on separate flights to not arouse any suspicion. Posing as the father of one of Nadeko's classmates, Kaiki infiltrates her home to search for any clues. Kaiki discovers several suspicious details, such as the fact that Nadeko had only photos of herself without any friends and that her parents, apparently not curious as to the cause of her disappearance, never opened Nadeko's closet as she requested. Kaiki determines that she was a very spoiled child. After a brief phone conversation with Hitagi, Kaiki decides to visit the Polar Snake Shrine to learn more about Nadeko. Immediately upon Kaiki making a donation at the shrine, a mysteriously cheerful Nadeko appears. Apparently, Kaiki is her first visitor, despite Nadeko's best efforts at renovating the shrine. Kaiki asks her several questions about her relationship with Koyomi, confirming her twisted conception of unrequited love and that she still means to kill Koyomi and Hitagi. Kaiki takes his leave after giving Nadeko some yarn for cat's cradle to occupy her time, promising to return before she perfects any patterns.

Returning from his visit at the Polar Snake Shrine, Kaiki asks Hitagi to meet him again, ending up in a Mister Donut restaurant. Kaiki claims that it will be easy for him to deceive Nadeko as at her current condition, she can't doubt anyone - she has turned even more childish than she was in her human state, unable to detect any ill will. He reveals his plan to spare Koyomi and the others by lying to her that they died in an accident, thus he needs Hitagi to convince Koyomi to cease all connections with Nadeko. Hitagi, relieved and crying, thanks him for his services. On the following day, Kaiki is approached by Yotsugi who comes with an ultimatum from Gaen urging him to pull off his scheme to deceive Nadeko, claiming that the stake is too high and the entire city may be destroyed should he fail. Despite accepting ¥3,000,000 as compensation from Gaen, Kaiki moves on with his plan and pays another visit to Nadeko, claiming that he has a special wish she can fulfill and he will keep visiting her in a 100 visit cycle. Nadeko cheerfully tells him that she destroyed the cat's cradle yarn and used a white snake instead. Terrified, he determines she is not only an idiot, but also insane. After the meetup, Kaiki tricks Nadeko's parents to have them leave their house and he takes the opportunity to investigate her room, getting startled upon finding out what she kept hidden inside her closet.

Kaiki returns to his hotelroom and finds an envelope with an anonymous message telling him to pull off. After tearing it up and flushing it in the toilet, he contacts Hitagi, telling her about the incident with Gaen and Yotsugi. He asks her if anyone else could profit from having him stop his plans to deceive Nadeko, however she has no idea who could have such goals. She asked if she could see the message, but Kaiki noted that he destroyed it already. Before hanging up, Hitagi warns him to beware of Nadeko. On the following day, Kaiki pays another visit to Nadeko just as promised, but this time he offers ¥20,000 and a bottle of sake instead of the usual ¥10,000, much to Nadeko's joy. Returning from the temple, Kaiki is approached by Hanekawa who wants to talk to him. As they return to the city on a cab, Hanekawa reveals that she had just returned from her search for Oshino overseas without Hitagi's and Araragi's knowledge and even though she knew that continuing to look for him is futile, she intends to depart again on the following day. It turned out that Gaen personally warned Hanekawa to stay out of the intrigue. She invites Kaiki to her hotelroom. Kaiki, after making sure she is on their side, suggests her to exchange information with him.

Kaiki learns from Tsubasa that strange phenomena have been happening in the town even before Shinobu arrived and because of that, Gaen was intending to have her become the new god of the Polar Shrine. However, because of Koyomi's interference, her plans have failed and Nadeko turned into a god instead. Tsubasa believes that Nadeko actually does not care about anything or anybody at all, and most likely doesn't really love "Big Brother Koyomi", thus the reason for her behavior. She is also worried if Kaiki is able to pull off the scam. On the occasion, Tsubasa asks Kaiki if Oshino has any relatives like a niece and he affirms that just like him, Oshino does not have a family at all, including siblings or such, making the existence of Oshino Ougi very suspicious. Through the following days, Kaiki keeps visiting Nadeko to play with her and bring her presents until the day of Koyomi and Hitagi's graduation finally arrives. After having a final conversation with Hitagi by phone, during which she demands him to never set foot in the city again once the job is done, Kaiki has a short meeting with Yotsugi on the way to the shrine. She repeats her warning and claims Kaiki won't be able to deceive Nadeko. On the occasion, it is revealed that Kaiki used his wits to bring down a cult that was deceiving Hitagi's mother but that ultimately led her to join another cult instead and for Hitagi's sake, he had her mother divorce and leave her family. Upon meeting Nadeko at the shrine, Kaiki attempts to deceive her as planned by claiming that Koyomi, Hitagi and Shinobu were killed in a traffic accident in the previous night, however, she instantly recognizes the lie.

Kaiki realizes that he failed to deceive Nadeko because she never trusted him at all, and because she was previously deceived by Ougi into claiming the charm and becoming a god. Nadeko unleashes a swarm of snakes onto the entire Polar Snake Shrine, immobilizing Kaiki. Believing that he was sent by Koyomi, she contemplates killing his sisters, Kanbaru, Hanekawa and Mayoi as well to punish him, until Kaiki reveals that he found out her secret aspiration to become a manga artist, as many drawings were hidden in her private closet. Embarassed for having her secret revealed, Nadeko starts punching and kicking Kaiki as he tries to persuade her. He claims that eventually her parents will open the closet as well and find out about her secret, unless she renounces her godhood and returns home. After convincing her that she should forget about Koyomi entirely and pursue her true ambitions instead, she agrees to get deceived again. Kaiki implants a fake slug apparition into her body to have her uncounscious during the exorcism, but he's interrupted by Koyomi rushing into the shrine. Claiming that he was sent by Gaen as a professional to deal with Nadeko, Kaiki extracts the snake charm from her body and returns it to him. Kaiki also instructs Koyomi to cut all connections with Nadeko for her sake, as she must move on with her life by herself - his relationship and romance with her would only make her an useless human being. After calling Hitagi and confirming that his job is done, Kaiki bids farewell to her and realizes that the secret message at his hotel was sent by no other than Hitagi herself, as she knew it would have him push further with his job instead of discouraging him, and Gaen's message to him probably was for the same purpose. As he leaves the city, Kaiki is ambushed and mortally wounded by one of the boys he formerly deceived, possibly the one who cursed Nadeko, and before he passes away he hears Ougi's name, implying that he was sent by her.