Sachin (Sachin Mani) and Isai (Aishwarya) are in a romantic live-in relationship when Isai meets with an accident. Sachin rushes to the hospital only to find Isai in the ICU.

Episode 1 - Accident

The story begins with a flashback where Sachin and Bharath are good friends. Sachin accompanies Bharath's family to Pondicherry to see a girl for marriage. Bharath and his family like the girl. While Bharath returns home with his family, Sachin decides to stay back for a couple of days and soon starts following Bharath's potential fiancée!

Episode 2 - Engagement

Isai, the bride’s best friend, loses her cool and confronts Sachin about stalking her friend but starts developing a soft corner for him upon discovering the truth.

Episode 3 - Falling in Love

Isai’s brother, a local goon, threatens Sachin and warns him not to get close to his sister. Despite the warnings, Isai falls in love with Sachin and expresses her love. Sachin puts forth his condition of staying in a live-in relationship before making any commitment.

Episode 4 - Love Expressions

Isai decides to live with Sachin for a week but tells her brother and sister-in-law that she is heading for a camp with her college friends.

Episode 5 - The Live-in Agreement

Isai and Sachin start their week-long live-in relationship and undergo hilarious as well as serious situations all leading to a series of emotions including romance and anger. Isai’s feelings for Sachin grow stronger and she falls madly in love with him.

Episode 6 - In Love, with the local guy

On day 6 of their live-in relationship, Bharath and Sruthi visit the young couple and use Sachin’s room to have get intimate. Later that evening, romance blossoms more between Sachin and Isai and they end up having sex.

Episode 7 - Love Making

The flashback cuts to the present situation where the mystery unfolds. The moment Sachin accepts Isai’s love, a terrible accident occurs and he falls off the terrace. In the process of saving him, Isai also meets with a road accident. What will the fate of the lovers be?

Episode 8 - Devil

D7 is a ZEE5 Tamil original series starring Sachin Mani, Aishwarya, Meenakchi, Aruldoss and Vinothini. The romantic comedy revolves around a young couple who make an agreement to stay in a live-in relationship for a week before wholeheartedly committing to each other. However, an unfortunate accident ruins their plans.

Season 1

D7 is a 2019 romantic comedy Tamil Original starring Sachin, Iswarya, Meenakshi and others. The story revolves around Isai, who falls in love with the RJ Sachin and proposes to him. Sachin tells Isai to prove her love to him, and tells her to be in a live-in relationship with him for a week. In the 7 days, Isai does everything to impress Sachin and to keep him happy. On the last day of the week, Sachin falls from the terrace because of Isai! Why did Sachin fall from the terrace? Will Sachin survive the fall? Will he accept Isai's proposal?