Chapter 17

Monster Musume: Everyday Life with Monster Girls (モンスター娘のいる日常, Monster Musume no Iru Nichijou) Chapter 17 is the seventeenth 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 September 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 4.

Plot
A health checkup reveals that Centorea and Meroune have gained weight during their homestay. Miia brags that her measurements are the same from her last checkup but a nurse tells her that they have a scale that she can fit on, it turns out she also gained weight. Ms Smith explains that they have not been getting enough exercise. The homestays discuss the few limited exercising options they have since they cannot leave the house without Kimihito, Smith directs the group to trial a newly established, "liminal friendly" gymnasium called Sports Club Kobold run by the eternally enthusiastic Kobold, Polt. Rachnera babysits Papi and Suu while everyone else is at the gym.

Upon their arrival, Polt has the girls try out various exercise equipment only to discover that none are appropriate due to their differing body shapes, so Polt moves the tour to the pool. Mero complains about the "no bikinis" rule and Polt explains that her gym has swimwear for liminals. While displaying the swimwear, Miia notices that Centorea's swimwear is also covering her front half, Miia asks if this is really necessary as Centorea's genitals are on the back of her horse abdomen. Centorea then pulls her shirt up, whereupon Miia and Mero see that the place where Centorea´s horse´s lower body merges into their human upper body (i.e. where the genitals of a human would be) is not covered with fur, i.e. is naked. After the homestays change into swimsuits and go out to the pool, Kimihito and Mero discuss the pool at their house. Miia gets jealous and pushes Kimihito into the pool. However, Polt does not allow anyone to swim until they do warm up stretches.

Kimihito is surprised Miia can swim since she almost drowned in Mero's pool. He sees Cerea in the pool and offers to walk with her but finds out that she is in a deeper section of the pool and is actually treading water. Kimihito asks in astonishment if she can´t swim normally, but Centorea notes that she doesn´t really have a certain way to swim because of her horse´s abdomen. Miia says, to Centorea´s annoyance, that it may be because of her big boobs that she can´t go underwater. Everyone watches Mero swim and dive, Kimihito compliments her which makes Miia jealous again, so she challenges her to a race with the prize being that they are allowed to do anything they want to Kimihito. Cerea says that she is also racing, but everyone ignores her.

While the girls use their attributes to the fullest in an attempt to win, the state of the pool water (cold and chlorinated) starts causing them pain but they still persist in the race. After Kimihito admonishes the girls for putting themselves through pain when they were supposed to be improving their health. When both ask if the race is a draw, it is revealed that Centorea had actually won the race. When Miia and Mero start to sink, Centorea grasps their swimsuits and pulls them out of the pool; however, this causes their swimwear to slide up, giving Kimihito a clear view of their genitals, much to their dismay.

Polt is delighted with how much she has learned to make her fitness center even better, how the pool has to be much warmer, that she will be using ozone instead of chlorine and that she will build a sauna. When Kimihito and his house guests leave, it becomes known what prize Centorea wanted from Kimihito for winning the race: she spends the rest of the day holding hands with Kimihito. All four are plagued by hunger shortly afterwards, which is why they go to a restaurant that also serves Liminals. They consider whether they could bring Rachnera, Papi and Suu some pizza with them, but at home it turns out that Rachnera is ready to go from Papi and Suu´s strenuous babysitting.

Key Events

 * Polt the Kobold is introduced.
 * First appearance of the Sports Club Kobold.
 * Mermaids get severely ill when breathing chlorinated water. However, regular rinsing with clear water can prevent or at least greatly reduce these negative effects.
 * Even heated water can cool down a Lamia.
 * Centaurs are able to swim (by treading water).
 * It is revealed that despite accepting Extra-Species, many places are still ill-equipped with dealing with the less human variants.
 * Lamia are revealed to be able to swim backwards.

Trivia

 * It is revealed that Lamias are able to swim backwards and use their tail as a spring.
 * When the two abilities are combined, it allows them to reach their top swim speed of 50km/hr.