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18歳、新妻、不倫します。
Meika is the heiress to a massive estate, called the Sanjou Empire. With her high school graduation, she is to marry her bodyguard Akira, and she is starting to think her actual budding romantic feelings are pointing elsewhere, but can that really be true?!
Meika fakes a marriage with her bodyguard, Kou, to avoid an arranged marriage, while both can date others secretly.
Meika secretly dates Uchida despite her fake marriage to Kou; as Kou works through an injury, Meika begins to take her job seriously.
Meika falls for Kou during their fake marriage; using dating tips as she navigates her first love and hopes for Kou's response.
Amane returns and confesses to Meika, unaware of her fake marriage to Kou; Meika faces a love triangle and a newcomer, Tsukisei.
Meika and Kou stay at a ryokan, watched by Amane; Tsukisei arrives, clashing with Kou and making Meika anxious.
Meika falls for Kou after hearing about his past from his ex, Mayumi; Kou's CM audition sparks Meika's jealousy over model Mamiya Ran.
Ran's presence reminds Kou of Sayuri, his past; he reveals Sayuri's link to Meika; as Meika's birthday nears, Kou reflects on his troubled childhood.
Kou's traumatic past, abused by his father, orphaned and placed in a harsh facility; he vows revenge with Tsukisei after Sayuri's death.
Kou, torn by Tsukisei's call to kill Meika for revenge, finds her missing and decides against it; he leaves a divorce letter and departs.
Tsukisei and Ran ambush Meika and the Sanjo chairman; Kou shields them and is shot; Meika, distraught, aims the gun at herself.
