Arashi(seme) has love allergy which will get cured at 20. Haname(uke) his child hood friend visits arashi sometimes. Arashi dreams about kissing and accidently kisses haname which cause the love allergy heart rashes to show up on his body. Haname confesses and then arashi also starts falling in love.
Miyoshi(uke),currently haname's and arashi's doctor falls in love with kaga(seme) 2ho has love allergy for him. One day they hearts disappeared and that made him anxious. Turns out kaga was going for a medicine trial. Miyoshi falls in love and they ares till dating now.
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