Kalit so'z Long Term Relationship

Kashiwazaki Yu has dated Naoki for the past 7 years and they have lived together for the past 5 years. Nowadays, their relationship has very little romance and Naoki seems to have no interest in marriage. On Kashiwazaki Yu’s birthday, Naoki seems to care more about his new game than celebrating her birthday. Kashiwazaki Yu is unable to control her anger anymore and runs out of their house. Perhaps by fate, she then meets her ex-boyfriend Fukami from her high school days. Kashiwazaki Yu soon finds herself in a love triangle with Naoki and Fukami.