Under Lover is the 6th chapter of the Citrus manga. It was released on September 18th, 2013.
Yuzu is still worrying about what happens in the events of the last chapter and wonders what to do, after trying to compete with Himiko that day to give Mei a binto box they end up eating luch together.
When Harumin walks up and ask them and Mei to join her at the amusement park the next weekend, Yuzu then looks at her planner and realizes that she is going back to her old town and invites Mei To Himikos dismay and the two spend the day together and connect deeper with each other. They also go to visit Yuzu's father where thay connect even deeper leaving Yuzu confused and unsure of there relationship.