Mortal Sins examines the motivations of the characters in this episode with a flashback analysis of episodes 1-4. Lucifer, Maria, and Levi all have different needs and desires, but they still came together as a team to help fight the Mortal Sins. There's plenty more to come.

Leviathan convinces Lucifer to practice action poses. Lucifer beats her up when she notices Leviathan is recording her.

Leviathan steals Lucifer's panties while she is showering, but Lucifer catches her and beats her up.

Asmodeus attempts to seduce Maria by cosplaying as a playboy bunny and then a dominatrix, but fails. She succeeds as a nurse and gives Maria a massage while preparing to use a vibrator on her.

Mammon sells photos of herself and the other Sins in states of undress. Eager for more profits, she makes figurines of them, only to realize the cost of making them is too great, leaving her in debt.

Astaroth participates in a cosplay photo shoot and becomes increasingly uncomfortable, especially since many of the photographers are perverts. She asks Belial and Belphegor for help, only to find they are photographers too.

Astaroth is running low on money. Belial tells her to just go naked to save on laundry and attract more fans. She attempts to do a performance naked, but becomes too embarrassed.

Satan takes in some stray kittens. They claw up her cape and she becomes angry, but forgives them because they are so cute.

This episode explores how hard Belphegor works to be lazy. She orders liquor on the Internet, but loses patience and goes to the store to buy it directly. She fishes for and cooks a cherry snapper, then after eating and drinking, sleeps under the cherry blossom trees. When she wakes up, she orders sake on the Internet.

Lucifer and Belial are sunbathing in Hell and decide to race to a mandrake root, but they slip on the ice. They decide to wrestle instead and rip each other's swimsuits off. Belphegor records them and says the footage will attract many followers.

Lucifer and Satan serve Beelzebub meat and she enjoys it in her thoughts, but her face remains stoic. Satan amazes Lucifer by being able to tell what she is thinking.

Mammon and Belial play Twister and Mammon wins. Mammon plays against Belphegor, but Belphegor uses her tail to reach a spot, which Mammon complains is cheating.

The Sins and Maria all relax in a hot spring. Belphegor gets drunk and Lucifer wins a leg wrestling match with Satan.

Lucifer and Belial play Tug of war with the rope attached to tape fixed to their genitals. Leviathan and Astaroth cheer them on, but Belphegor, who wasn't paying attention, throws away an empty sake bottle. The bottle lands on the rope hard enough to rip the tape off, making the two scream in pain.

Leviathan buys a pack of bandages, then in the restroom, she painfully replaces the bandage over her groin.

On Christmas Eve, Satan dresses as Santa Claus to make children happy. She tries to go down a chimney, but gets stuck. She struggles, but accidentally rips her clothes and falls to the bottom naked.

Astaroth visits Belphegor and berates her for her extremely messy room. When she spots an erotic video game, Belphegor suddenly seduces her and they start having sex. This is revealed to just be Astaroth's daydream. Embarrassed, she tries to leave, but bumps into a pile of junk and gets buried under it.

In either a fantasy or virtual world, Mammon seduces an adventurer who finds that touching her breasts increased his strength, so he thanks her with gold. She opens a booth charging people for access to her breasts.

Beelzebub, Belial, Mammon, and Asmodeus relax in the hot spring, but Beelzebub is jealous of the others for their large breasts. The others combine their powers to enhance her bust size, cheering her up, but her new breasts turn out to be fake when they fall off.

Asmodeus captures Maria and tries to make her submit by feeding her an aphrodisiac, but the now lust-maddened Maria overpowers her and ties her up. Maria tortures her with a vibrator and says she is now Asmodeus' master, which Asmodeus enjoys.