Chapters 140-144
Short Summary
Keima must take the necessary steps to awaken Mars; the Jupiter Sister within Yui.
Main Summary
Keima next sets his goal on Yui who is revealed to be the Goddess host of Mars moments after Keima threw her off balance cross-dressing.
Keima sets up a date between him and Yui at an amusement park. When they enter the horror house however, they are attacked by a vintage member (set up by Keima previously to be Haqua in disguise). Unbeknownst to this, Mars switches with Yui and fights Haqua off as Keima's protector; stripping her of her clothes and running off in embarrassment. Afterwards, Yui kisses Keima; awakening the fourth Jupiter Sister.
- Cross Dresser: Keima's plan to throw Yui off her game.
- Knight in Shining Armor: Yui and Mars play as this in the horror house to Keima's Distressed Dude
- Stalker with a Crush: What Yui comes off as when Keima first spots her outside his house.
