Species 4: Everyday Life with a Slime

The 4th episode in the series, it introduces the 4th girl to live with Kurusu, Suu.

Plot
The episode starts with Miia staring dreamily into space, thinking about Kurusu's proposal to date her a potential marriage candidate(albeit in a way that was drastically different to how he really suggested it), before writhing in delight at the thought. We then get a shot at a strange, slime like liquid, before cutting to Centorea who is in a similar state to Miia, shining her sword and quietly saying "Marriage, huh?". Quickly snapping out of the state, her thoughts are interrupted by Papi who asks her to play a game with her. Centorea refuses saying she needs to polish her sword. We get another shot of the mysterious green goo and then Kurusu states that dinner is ready. Papi asks Kurusa to play a game with her to which he simply says "After dinner, Papi", after which she drags him into the living room saying "Hurry, hurry". Miia checks the cooking pot to find to green goo inside, which quickly attaches to her face causing her to pass out.

After the opening, we find Kurusu nursing Miia after she passed out from suffocation, and Centorea reveals that what attacked her was a slime. Kurusu is surprised as he didn't know such things existed, but Centorea says that slimes are just one of many species that human society doesn't recognize. Centorea tells him not to worry however, saying that she won't allow the slime to harm him. Papi butts in asking Kurusu to play a game with her but Centorea scolds her saying there is no time for games. The slime reappears and Centorea attempts to cut it in half but is surprised to find her sword has no effect, as she thought that slimes were supposed to be the weak ones in RPG's. They both end up getting covered in slime and Centorea ends up in a very lewd looking state, so Kurusu bolts towards to bathroom in order to wash himself off. While he is thinking of a solution to their "slime problem", Centorea knocks on the door and simply says "Would it be okay if I...". Kurusu says yes unwittingly inviting her into the bathroom with him. She walks in completely naked much to Kurusu's surprise, and she unwittingly slips, falling over and trapping him underneath her breasts. She says that she can't get all of the slime off herself and so Kurusu washes her backside as she cannot reach there herself. When he asks her what she usually does when she needs to wash back there, he unwittingly cleans around her "rump", an erogenous and sensitive area. Flustered and babbling, he exclaims that he will just wash somewhere else,, and so moves onto her breasts, all the while a silhouette appears on the glass door. He says that he just panicked and the both of them give up on washing Centorea. Trying to change the subject, he says, "I wonder why the slime attacked us?". Centorea answers, saying is was probably looking for water. Kurusu then says, that it would "be dangerous to let it in the bath then, aha", before the slime appears above them and the water. Centorea on reflex tries drawing her sword, but instead reaches for Kurusu's penis instead, grabbing it while he screams "that's not your sword!". Taking a few seconds to sink in, centorea simply looks at her hand before screaming and falling over, hitting her head and falling unconscious.

The slime grabs Kurusu while he struggles, thinking he is going to be eaten, but it then miraculously transforms into a a beautiful and curvy female form. She follows by washing him in the same way he washes Centorea, rubbing him down with her breasts and scrubbing him down with a brush. Kurusu realises that she is trying to communicate by copying everyones actions, and is lulled into thinking she isn't that dangerous. Almost immediately after though, she squeezes Kurusu between her cleavage absorbing his entire head into her body, suffocating him. After a few panicked seconds, he manages to jump into the bath causing the Slime to be dissolved inside the tub, allowing him to escape with his life. He leaves her in the tub in order to speak to Miia(who has now recovered) and Centorea. They explain that keeping the Slime around will be too dangerous, as it has no common sense and may end up harming or even killing Kurusu. While the conversion was going on however, the Slime had been playing games with Papi.

After a commercial break, we find that the Slime has absorbed several of Miia's possessions and got slime on Centorea's sword. Papi says that it isn't her fault, and names her Suu. Miia and Centorea tolerate her for the time being. They dress her in a raincoat and waterproof boots to stop her for getting things wet or absorbing things by accident. Centorea and Miia inform him that it is possible that Suu was smuggled into the country or was accidentally delivered while hiding on some foreign export, and so he could get into legal trouble for Harboring an illegal immigrant. Centorea says that she should be turned into Miss Smith and possibly imprisoned before she has the opportunity to accidently suffocate someone and push the friction between humans and other-species to the breaking point, destroying everything they have worked so hard to create. Papi overhears this though and thinking that Suu will be imprisoned flies away with Suu. While Kurusu is chasing them, Papi flies over a river, scaring Suu and causing her to drop onto Kurusu below. Due to her anatomy, she falls unscathed however. When Kurusu asks why she ran away, Papi says it was because he said people would imprison her even though she did nothing wrong. When he says that he nearly died, Papi simply says "That happens all the time!" and that she'll protect Suu no matter what.

It is then that a group of kids comes up asking her to play with them, one of which is the girl Papi saved from the tree in episode 2 who reveals that Papi sneaks out to play with them all the time. It becomes clear why she is so popular as the "pervy kids" as Kurusu calls them enjoy being hugged while her t-shirt is wet and her breasts are visible. While this is happening, Suu absorbs water from the lake, gaining her curvy figure and following in Papi's example, squeezing one of the boys into her cleavage, before pointing her finger and squirting them all with water.

When the water fight goes onto the road, The Racist Couple, is seen driving a large car at speeds far exceeding the speed limits, almost hitting one of the girls. Suu saves the girl by using her body to absorb most of the impact, causing her to stick to the wall. The wall in turn falls apart due to the car crashing into the wall and Suu almost falls towards the river. Papi tries to save her by grabbing her but can't hold on due to her not having suitable hands to do so and Suu's slimy body. Papi falls backwards in distress thinking that Suu has died, but is shocked to see her perfectly fine to to Kurusu positioning the car directly below her.

After saying goodbye to the children, Kurusu calls Miia and Centorea telling her that he wants Suu to stay with them at his house. They are surprised to hear this, but he simply says that he doesn't want to report her after Suu has done nothing wrong, all the while Papi is fondling Suu's breasts, who seems indifferent at of the attention. When Kurusu tells them to just think of Suu like a child, they both have vivid fantasies of Kurusu and them having children, at which point they agree.

The episode ends by Kurusu telling Papi not to let Smith know about Suu, to which she agree's, only to find her in his house as soon as he opens the door.

Trivia

 * This episode is based on Chapters 8 and 9 of the manga series.
 * In the manga, it was actually Miia that cooked the stew Suu was first found in, rather than Kurusu