Kaoru and Yuka are childhood friends however when they entered middle school their friendship drifted and Yuka had form group of friends and one of his friends is Taiga. The day come where they take their gender exam and Yuka's results shows he is an Omega and that devastated him and he was scared because he might get attack by alpha. Kaoru and Taiga's results shows they are both an Alpha and one day Yuka was in heat and both Kaoru and Taiga was greatly affected by it and Yuka was almost raped by Taiga however Kaoru defend Yuka from Taiga cuz he has feelings for him and bite him then from that day Yuka and Kaoru became pairs. Later on Taiga realize that the reason why he was greatly affected by Yuka's heat and scent was because they are fated pairs. Some years later Taiga has a live in/sex partner named Rin. Rin is an omega who works in a restaurant he has a sad past he was raped which cause him emotional and mental trauma.
Yuka went to his doctors appointment then he realized that Taiga was his fated pair and then he bump into Rin and Rin invited him to the resto he works at. Yuka invited Kaoru to that resto and BOI THIS CHAPTER IS THE MAJOR TWIST RIN AND KAORU ARE FATED PAIR because after they met Kaoru went into rut. So Rin wanted to be bitten by Kaoru but Kaoru refuses leading Rin to overdose on his suppresant. Later on Taiga confess to Rin that he loves him and Rin also felt the same then they become pair after Taiga bit him. However THIS IS THE SAD PART MTHFCKRS RIN DEVELOPED A NEURO PROBLEM WHERE HE FORGETS STUFF FROM THE TIME HE OVERDOSE FROM THE HEAT SUPPRESANT. But Taiga said he willl continue to love Rin and they will build ne memory. In the end Yuka and Kaoru had a child name Mirai and Rin and Taiga are still madly in love making new memories. I FUCKING LOVE THIS OMEGAVERSE STORY 10/10 for the plot and art. Character development is also great. HOWEVER i would LOVE to read a separate manga for Rin and Taiga.
Shounen No Kyoukai