Okayadoverse

In-Universe Timeline

 * 3 Years Ago The Cultural Exchange Between Species Bill is initiated and the existence of mythological liminal species and cultures are revealed to the public.
 * 1 Week Ago Co-ordinator Kuroko Smith introduces Miia the Lamia to Kimihito Kurusu as his new cultural exchange participant despite him never signing up to the program.
 * Manga Begins After one week of staying together, Miia falls in love with Kimihito and starts offering to become lovers despite the exchange rules forbidding such an action.
 * 1-2 Days Later On Smith's arrangement, Miia and Kimihito go on a date through Tokyo.
 * Next Day Kimihito is abducted from his home by an absent-minded Harpy named Papi, they learn that Papi was a constant flight risk due to her poor memory causing her to run away from her homestay houses and was on the verge of being deported from the country. Having empathy to her plight, Kimihito volunteers to be her new homestay host and discovers that Smith was about to assign her to him anyway.
 * 1-2 Days Later While shopping for groceries during the early hours of the morning, Kimihito encounters a Centauride named Centorea who was in the process of hunting down a neighbourhood purse thief. As Centorea shanghai's Kimihito into aiding her; as she wouldn't be able to arrest the thief herself once she found him due to the exchange laws stating that liminals could not assault or harm humans without legal consequence, the pair discover and chase the thief across the town, resulting in his successful capture, although Kimihito was injured in the process while he protected Centorea from an attack. Returning home, Centorea declares her desire to continue her exchange program with Kimihito as her homestay host and moves into his house with the other two liminal girls.
 * Next Day Disturbed by the arrival of two "rivals" for Kimihito's affections, Miia attempts to establish herself as Kimihito's girlfriend but only manages to irritate Centorea, who has come to view Kimihito as her intended "lord"; to whom she intended to devote her services to. As the tension between the three girls grows until they were on the verge of physically fighting each other in a public park, Kimihito attempts to interrupt them only to become injured when co-ordinator Smith arrives, sees the three girls about to start fighting, and pulls out a gun to tranquilize them only to shoot Kimihito instead. As Kimihito recovers, Smith informs him that he was selected to be a test subject for marriage within the exchange program.
 * As the three girls restrain themselves on vying to be his girlfriend/bride the night's Full Moon causes them to express their desire for him uninhibited, resulting in Kimihito attempting to flee from them throughout the night. The following morning Kimihito announces that he was not going to marry anybody until he dated each of them first.
 * Interperse The Monster Ops: Neutralization squad deals with an incident caused by the Pioneer Orc Renaissance Kinsmen group. The group has dinner at Kimihito's house afterwards.
 * 1-2 Days Later As Miia attempts to gain "wife points" by cooking for the household, only to reveal that she can't cook, she is forced to rely on Kimihito when her tail starts moulting and she was unable to clean it due to having burned her hands while cooking.
 * Next Day As Miia continues practising to cook, she suddenly discovers a Slime hiding inside her stew pot. After a few mishaps as the slime attempts to find various water sources, it begins mimicking the actions of the house residents.
 * Next Day As Papi befriends the slime; naming the slime Suu, she attempts to protect her new friend by running away when she overhears Kimihito and the other two girls discussing what to do with an illegal liminal in the household. Chasing Papi down, and discovering that Papi had been secretly venturing outside the house to play with the Neighborhood Kids without his knowledge,  Kimihito decides to let her stay after Suu saves one of the kids from being hit by a car.
 * While initially fearing that Co-ordinator Smith would not take too kindly to discovering Suu, an unregistered liminal, living at his house, it is soon discovered that Smith was more preoccupied with renovating Kimihito's house for the introduction of a new exchange student; a Mermaid named Meroune Lorelei, and was voluntarily ignoring Suu's presence in the household.
 * Next Day Concerned that yet another girl had arrived to steal her "darling's" attention, Miia soon learned that Meroune was actually more interested in an unrequited/cuckqueaned relationship with Kimihito due to a cultural fetish for "tragic romance" and actively supported Miia's claim on him.
 * 1-2 Days Later Kimihito goes out into a rain storm to save Suu who had been outside and gotten caught in the weather.
 * Next Day Kimihito is stricken with a cold and fever after going out into the rain to save Suu. After curing Kimihito of his illness, Suu declares her love for him.
 * Next Day Kimihito gains the attention of a man named Kasegi who intends to take advantage of liminals to make money off of them. Posing as a documentary film-maker, Kasegi attempts to steal Miia's shed skin (which she kept in her room since the shedding incident a few days previously) and a Harpy egg Papi was in the process of laying, however, with Suu's help the household discovers the man's less-than-benevolent intentions and thwarts his attempts. Escaping the police, Kasegi returns to his apartment but is entrapped by the Arachne he was exploiting for her silk.
 * Next Day Managing to call the police, the MON squad rescues/arrests Kasegi but fails to arrest the Arachne, who fled the apartment and abducted Kimihito after hearing about him from Kasegi.