Hana works in a cafe and secretly longs after regular patron, Renjaku, who's a florist. Everyone assumes that Hana is an alpha but he's actually an omega. When Hana is walking home one day he goes into heat for the first time, way later than omegas usually go into their first heat, and Renjaku is there and tries to help him.
Takane no Hana wa Chirasaretai