Hitotose Chitose is now living together with his 5 teachers as his mothers when a mysterious girl appears and becomes their neighbor which turns out that that person is Nagatsuki Kuron who wants Mu-chan to be her mother so another sibling rivalry ensues as to who would end up as Mu-chan's child.

Included with the limited edition BD of Fate/kaleid liner Prisma☆Illya Movie: Sekka no Chikai.

Hasukawa Kazuya is in a terrible bind. His brother's new wife is also the woman that Kazuya secretly loves. Determined to avoid them both, Kazuya leaves home to live in the student dorm called Greenwood. There, he hopes to find peace of mind. Unfortunately for Kazuya, stability and peace are the last things one might find at Greenwood - home of the weirdest characters on campus.

The OVA of set to premiere in theaters in 2023.