Chapter 12

Monster Musume: Everyday Life with Monster Girls (モンスター娘のいる日常, Monster Musume no Iru Nichijou) Chapter 12 is the twelfth chapter of the Monster Musume: Everyday Life with Monster Girls manga series.

Written and drawn by mangaka Okayado (Inui Takemaru), this chapter was released in Japan on April 19th, 2013, by the Japanese publishing company within the seinen manga and anime magazine,.

The chapter was later gathered as part of the series' tankōbon volume Monster Musume: Everyday Life with Monster Girls Volume 3.

Plot
Kimihito Kurusu helps his new homestay Meroune Lorelei settle into her new home, starting by picking her up to carry her up the stairs. Miia immediately misunderstands the situation as the two having a romantic moment and jumps on Kimihito's back, knocking all three of them to the floor. This results in Meroune's wheelchair being destroyed by Miia's tail and Kimihito being forced to carry Meroune around the entire day as Ms. Smith cannot bring a new chair until the next day. Miia is upset that her actions have caused Meroune and Kimihito to spend more time together while Centorea tries to calm Miia down, but the lamia is convinced that Meroune is her most serious rival, as she sees the other girls as having flaws that make them unsuitable as marriage candidates. Miia's concerns are only increased when Mero asks Kimihito if he has a girlfriend.

The question surprises Kimihito causing him to trip and accidently grope Mero's breast. Miia gets more upset at the sight, forcing Kimihito to panic and accidently pull off Mero's bikini top, only distressing the lamia more. Mero explains that the situation is not entirely Kimihito's fault as Mermaid's are covered in a slime membrane so their gills do not dry out and that she does not mind if Kimihito sees her naked. Miia believes that Mero is already charmed by Kimihito and decides that she must start trying new ways to seduce him immediately. When Centorea comments about how Suu attacked Meroune yesterday because of her mucus, Miia gets an idea and decides to "play" with Suu in order to cover herself in the slime and make her appear wet. When she suggestively presents herself to Kimihito, the romantic subtext is lost on him and he suggests that Miia takes a bath.

With her first plan failed, Miia decides to lower the temperature by messing with the Kurusu House's heating system, figuring the mermaid will freeze because she is practically wearing only a bathing suit. This ultimately backfires as Miia's cold-blooded reptile physiology causes her metabolism to slow down, forcing her into hibernation, while Meroune remains comfortable as Mermaids are acclimated to the freezing depths of the ocean. Kimihito notices the change in temperature and tries to raise it but finds the batteries in the remote control are dead and he leaves to find new ones.

Seeing that all of her plans are failing, Miia makes the decision to enlist the others girls' help while Kimihito is out of the room. Papi immediately abandons the idea as she considers Meroune nicer than Miia. Meroune asks Papi if Kimihito has a girlfriend, prompting Centorea to ask why she is so keen on knowing this. Meroune explains that "The Little Mermaid" fairy tale is popular among merfolk as they grow up reading it. When she comments that she frequently attends operas and musicals, Centorea begins questioning Meroune on who she really is as she speaks in a very formal dialect and everyone, including the usually careless Smith, treats her with very high reverence.

Instead of answering the question, Meroune asks Centorea if she is Kimihito's girlfriend, throwing the centaur off guard. Mero continues by saying that she is impressed by Centorea's loyalty to Kimihito and praising her knight-like behavior. This causes Centorea to feel like she is standing in front of royalty and she is forced to bow to the mermaid. Miia, finally tired of losing, tells Meroune that she has no intent on letting the mermaid be with Kimihito, to which Meroune ominously replies that the feeling is mutual. With her gills dried out from the dry air, Meroune asks a now returned Kimihito to bring her to her room.

Miia becomes more upset and worried about Meroune's intentions, but Centorea reminds her that it was her jumping to conclusions that lead to them spending so much time together. Miia, however, reveals to Centorea and Papi that she wants Kimihito to herself because when she was a child she liked to read fairy tales that ended with a prince and princess living happily ever after, and that she always wanted to be bridal carried like a princess since she was little (with Centorea thinking to herself that that is biologically impossible for Miia to be carried that way). Miia then says she does not like that Meroune thinks she can tempt Kimihito in a swimsuit, to which Centorea tells her to just wear a swimsuit herself.

In her room Meroune asks Kimihito again if he has a girlfriend. Once again he says no and asks why she keeps asking, but before she can answer, Miia and Papi enter the room in their swimsuits, with Miia trying to seduce Kimihito as she is confident that she is showing more skin than Meroune. However, her attempts are interrupted by Centorea who enters the room in an even more revealing swimsuit. Miia accuses Centorea of trying to seduce Kimihito only for her to reveal that the suit is too small because she borrowed it from Miia. Papi then sneaks under Centorea's pareo saying she is looking for Suu, but she inadvertently stimulates her into running off and dragging Papi along.

As Miia turns her attention back to Meroune and Kimihito, she is horrified to see the mermaid pulling Kimihito into the pool. Miia jumps into the pool in an attempt to save Kimihito, but as she dives deeper towards the two she finds that she is unable to move due to her body temperature lowering. Miia begins to drown at the bottom of the pool, but Kimihito appears and brings Miia back to the surface with Meroune's help. When they surface Meroune expresses concern for Miia and tries her best to warm her up while Kimihito's head gets engulfed by Suu.

Meroune reveals that Kimihito pushed them into the pool as Suu tried attacking them because she was dehydrated from when Miia changed the house's temperature earlier. Realizing her mistake, Miia begins to feel bad about how she has treated Mero and goes to take a bath to raise her body temperature, with Meroune asking to join her. In the bath Miia apologizes to Meroune for being rude, but still reaffirms that she will not let anyone else be Kimihito's wife.

Mero reveals, however, she is fine with that as she wants a "tragic romance" like "The Little Mermaid" and she wants to be Kimihito's mistress, not his wife. Mero starts molesting Miia and says she will help her become Kimihito's wife as long as she does not mind Meroune being his mistress, a situation that Miia does not like the sound of. Outside of the bathroom the other girls listen and Kimihito says he is glad that everyone is finally getting along.

Key Events

 * Meroune's desires and feelings for Kimihito are revealed.
 * Centorea is beginning to suspect Mero of noble origin based on Mero's speech, her manners and her aura.
 * Mero explains that she wants to be Kimihito's mistress, not his wife, because she wants to experience a tragic love story like the Mermaid in "The Little Mermaid".
 * More information about Mermaid biology is revealed.