Gloria Kindan no Ketsuzoku/GLORIA, Gloria: Private Lesson is a three episode OVA. Each episode is 27 minutes long and they were released from 1997 to 1998.
The Gloria family has long been one of the wealthiest and most prominent empires in Boston. When top students Kira and Beowulf are offered tutoring jobs at the Gloria estate, the two young men are more than willing to oblige. Beowulf is immediately attracted to the icy beauty Eterna Gloria, eldest daughter of the Gloria family. Eterna is the only daughter who’s not adopted to boot. Beowulf wastes no time in pursuing Eterna, and Kira is left in charge of Eterna’s four sisters — Celia, Naomi, Charm, and Mary. But there have already been several attempts at the Glorias’ lives since Kira and Beowulf started… and the matriarch Ms. Michelle Gloria seems to be keeping a very big secret…!
Gloria Kindan no Ketsuzoku/GLORIA, Gloria: Private Lesson: You are Kira Akishino, an ace student from one of the best universities in Boston. You are offered a tutoring job at the illustrious Gloria mansion, along with your friend George. The Gloria family has long been one of the wealthiest and most prominent empires, and they need you and George to tutor one of the five daughters. George is immediately taken with the eldest daughter — the strong-willed Etana Gloria, which leaves you with four others to choose from. There’s Sicile, who has the worst grades of them all; Mary, the naïve golden-haired angel; Naomi, who cares about nothing else but drinking; and Charme, the most brilliant one of the Glorias. But there’s something more to it all… the Glorias are hiding some things, and it’s up to you to find out what they are. Will you be able unlock the family secrets? Or will you just be a good tutor? Who knows, you may even end up marrying one of the Glorias…
No DVDs found, but I did find a video stream. There’s also the subscription service below.