Touma, who is an incubus and a host, is saved from a problem with a customer by Yuuri, a kindred spirit who happens to be there. Touma takes an interest in Yuuri, who is an incubus but has a tendency to be a bit uncommunicative, and seduces him with a superb kiss as he endures a hunger pang. The two are so aroused by the taboo of having sex with a member of the same species that they can no longer control their desires.

Just like how adding sugar to lemon makes the sourness milder, there are interactions between flavors. Adding sourness to a strong sweetness can make it refreshing, or sweetness can bring out the spiciness. One flavor can stand out, be suppressed, or the flavors of both can be made to complement each other. Maybe this can also be said about human relationships!? Amaji, Karashima, and Suya, three people in their 30s with surnames that mean "flavor," weave a fun and delicious second home life! We bring you the chemical reactions of life woven by the combination of flavors.

1-4 & 6) Suou has never been able to find a accompanist that he is satisfied with, that is until Kobayakawa came along. Only thing, he looks and sounds like the guy that he is in love with, his piano teacher who is getting married in the near future. Will he be able to get over his heartbreak with such a deadringer by his side? 5) Kikugawa the school jock is popular and has tons of people fawning over him. He always replies "Yeah, I know" with a knowing smile to all declarations of love. His lover Shiba feels uneasy about their relationship with such an easygoing attitude.

Minato, a music student, is attacked by a mysterious man the night his beloved cat dies. Just then, a grim reaper named Nero comes to his rescue, telling him he's come to take him. Nero continues to protect him whenever he's in danger, but Minato, unable to understand his true intentions, is terrified. However, each time he experiences Nero's kindness, he finds himself beginning to accept him, a feeling of bewilderment within him.