Two couples, childhood friends to adults, omegaverse. The kind Kaoru always followed along after his neighbor and friend since they were small, the popular and outgoing Yuka. In MS, Yuka stepped away from Kaoru who was kind of a gloomy loaner, and made new friends and avoided Kaoru. Then they had their 2nd gender test, only for Yuka to have his world destroyed to learn he was an omega. One of Yuka's new friends, Taiga, attacks him at the school and Kaoru forces a bite-bond on Yuka to keep him from being gang raped. Flash forward to adults, and now 20-something or 30-something Taiga is living with a teenage omega Rin for the sex, but refuses to bond with him because Rin is not his fated partner. Then Rin realizes after running across them that Kaoru is his fated pair. What will happen? Excellent series; makes very good use of the omegaverse setting, and the Fated Pair trope is used in a very interesting and unique way. All of the characters are complex and interesting, and it's heartbreaking the challenges they face and the things they are forced to go through. This is probably the best omegaverse ever written; it has complex thoughts on the subject and human nature in general. It doesn't get better than this. A+++
Shounen No Kyoukai