Memory of Chaos: Kotori Itsuka

Memory of Chaos: Kotori Itsuka was a character scenario released in Mass for the Dead, featuring the character Kotori Itsuka.

Episode 1: Information Exchange
After resolving the incident of Dark Tohka, Kotori and others, for the time being, decided to reside in the Great Tomb of Nazarick. At the Round Table Room, Kotori and her group meet up with Momonga, who wanted to discuss how they were adjusting to Nazarick. He already heard stories from both Sebas Tian and Yuri Alpha that the newcomers were enjoying themselves in the cafeteria the other day. Kotori states that ever since Tohka returned to normal, she has been happy with the delicious food that was provided.

The Overlord states that the food and accommodations were as he provided to his guests. He then moves on to the main subject which involves Tohka. Tohka present apologizes for her behavior in attacking Momonga's group first as she had mistakenly believed Nazarick was aligned with DEM. Momonga understands that it was an unfortunate accident and that they should move forward in establishing a cooperative relationship by first exchanging information with each other's side. For instance, topics of information that pertain to "Spirits" and the "Neighboring World." Kotori agrees to summarize these two materials for Momonga who then orders Demiurge to review the received data. Additional information on the type of civilization they hail from is also requested as well as Kotori's affiliated organization which the young commander complies to explain in further details.

The information exchange meeting was therefore represented by Kotori who proceeded to smooth out the details of their knowledge to Nazarick while being watched by the attentive gaze of her foster brother Shido Itsuka. The information that Momonga receives impresses the Overlord, noting that despite Kotori's age her accomplishments and intelligence make her worthy of her rank as a commander. Before they continue working further on the exchange, Momonga asks if Kotori and her friends would like to see something special.

Episode 2: Night Sky
On the 6th Floor of Nazraick, the visitors from another world are brought to see the night sky. Tohka, upon seeing the sight finds it beautiful, while Origami Tobiichi deduces it to be fake since they are still underground. Kotori admires the scenery, noting the pristine natural view and clean air of the floor. Momonga is honored that she admires the night sky, and claims that his comrade Blue Planet was the designer of the scene and would have been delighted at their praises. Kotori thinks that Momonga just wanted to brag of his home's abode as he personally devoted his time to give them a tour of the 6th Floor after the smooth transaction of information. Secretly though, Momonga was gauging Kotori's reaction on the scene. As only those who lived in a world, where science technology reigned with air pollution that made such night skies impossible, could truly appreciate the precious value a clear sky.

Shido, while admiring the sky, wishes that Kurumi Tokisaki was here to see it. Momonga is unsure about that Spirit as despite accepting her into Nazrick and Shido's group vouching for her, he is wary of the potential danger. The Spirit thus has been given strict supervision by Nazarick. Shido tries to make an argument but Kotori reminds him that Kurumi has been allowed to remain in Nazarick in exchange of information just as they have which her brother should take solace in.

Momonga seeing the two siblings interact with each other makes him recall a similar scene that had happen before him in the past. Tohka wonders if he is talking about Aura Bella Fiora and Mare Bello Fiore, but the Supreme Beings replies he was referring to a different pair of siblings entirely rather than the two mentioned by her. Before he could give further clarification, two voices ring out in the darkness greeting Momonga.

Episode 3: Teaching
One of the voices is revealed to belong to Aura who rushed to greet Momonga. The other belongs to Shalltear Bloodfallen who also came after dealing with the routine Chaos Beast patrol around the Crack. The two women soon get into a fight over Momonga's attention. They are reminded to be on their best behavior as they have guests. Aura and Shalltear, breaking away from fighting realize the presence of the humans and greet them. Shalltear seeing Kotori identifies her as the one that was shadowing Albedo in her date with Momonga. Kotori who previously was unaware of Shalltear's and Albedo's love rivalry over Momonga, is then taken aside by the vampire to have a private talk with the permission of Momonga and Shido. Aura, worried that Shalltear might do something strange to the human commander then follows the pair.

In the forest of the 6th Floor, Kotori asks the Floor Guardian what she wanted to talk about. Shalltear states that she knows that she was assisting Albedo behind the scenes in strengthening her relationship with Momonga. News to Aura, she asks Kotori if it's true. Kotori admits that she played a part in it. Rather than being angry at Kotori, Shalltear had expected that the "big gorilla" would do something like this. She of course is talking about Albedo. It was lucky that she stopped the date from progressing when Albedo was about to kiss Momonga. Given how Albedo was so close in sealing the deal, it speaks volumes of Kotori's skill as a "dating" expert. So she wishes Kotori to tell her the secret to a successful "date". Aura too also wants to get in on this secret as well. Kotori sees that the two think that she is some kind of expert, as her common sense tips and advice were what allowed Albedo to progress her date so far. Kotori decided to give the two some common-sense dating tips. However, the words don't really come off as understandable to Shalltear. Aura suggests that they put the advice into practice. Kotori thinks that might be difficult as it seems that Momonga will be busy in his discussions with her. While admitting that to be an obstacle, Shalltear asks if there is a way to practice another way without Momonga.

Episode 4: Practice
Later, on the 9th Floor in a corridor, Kotori wonders to herself how she got into this mess. Shido standing alongside asks if she saw something behind them. The young commander denies it but knows that she and Shido are being followed by both Aura and Shalltear from behind. Shido is unconvinced and wonders what is bothering his little sister. Unbeknownst to Shido, Kotori is using him to demonstrate dating for the two Floor Guardians. Thinking that she needed cheering up, Shido then stroked the girl's head much to her surprise. Shido believes that she might be tiring herself out as she has been communicating with Momonga on behalf of them. Kotori states that she doesn't mind as she finds it more fun negotiating and talking to the top brass rather than playing with stupid stuffed animals. She gets her next surprise when Shido picks her up in an embrace, stating that she was his important little sister and not to make him worry. Kotori wonders if Shido is getting sick and what's with the corny lines, claiming he should save it for Spirits. Shido notices something odd as Kotori's ribbon suddenly changed color which Kotoru attributes to her being happy. Getting out of her brother's arms, Kotori accidentally bumps into a skeleton, causing her to scream at the sight whilst Shido and the two hidden Floor Guardians watch.

Episode 5: Intermingling
Later on, Kotori ask if what they saw was helpful, which the two Floor Guardians state was more than enough. Kotori is abash stating that it seemed mediocre to her as it wasn't a proper date, but Shalltear thinks that she is too humble as she was playing Shido right where she wanted him but being hard to get. While impressed by her demonstration with Shido, Shalltear asks if their deep relationship between the two is due to them being siblings or if there are certain feelings that have yet to come to the surface. Kotori doesn't answer but Shalltear deduces that Kotori does not have confidence in showing her true colors due to the lack of her sex appeal, which she of course sympathize as should Aura. Though Aura states that both she and Kotori are still growing unlike Shalltear who will forever remain flat chested. The two Guardians, soon get into a brief argument claiming that they won't lose to the other. Now that they got the frustration out of the way, Shalltear invites the two to a time in the public baths to relax.

Elsewhere, Shido is walking with Momonga while talking about Kotori. Momonga admits to Shido when he saw the two interact with one another he had a sense of nostalgia, remembering the creators of Aura and Shalltear bickering like so. Momonga then takes the opportunity to invite Shido to spend a session at the baths since they have nothing that requires a need for an urgent schedule. He also plans to invite several other escorts to join them. It is mentioned that when Shido and Momonga headed to the spa resort—-in order to prevent Origami and Albedo from trying to charge the men's bath, Kotori and her colleagues on the women's bath side will join forces to prevent them from doing that. Thus, further deepening their relationship with Nazarick.

Trivia

 * This character scenario was released prior to Date A Nazarick, acting as a spoiler to the special collaboration event.
 * This character scenario was released alongside the Memory of Chaos: Kurumi Tokisaki, Memory of Chaos: Tohka Yatogami, and Memory of Chaos: Origami Tobiichi from Date A Live.