Alternative version of final four episodes of High School DxD BorN.

Following an automobile accident that claims the life of his parents, Teppei Arima is taken in by his grandfather and introduced to the world of the rich and the elite. Compared to his humble upbringing, Isshin Arima's lavish lifestyle surprises and stuns the young teenager. In return for the gracious hospitality, Teppei is expected to continue the family business by replacing his grandfather as the head of Arima Financial Combine, and to prepare him for these responsibilities, he is enrolled into an esteemed high school. Along with his recently acquired celebrity status and affluence, Teppei is informed of an arranged marriage with the equally prosperous Sylvia van Hossen, thus, beginning the thrilling escapades of his new life! [Written by MAL Rewrite]

The year is Universal Century 0079. Oliver May is a technical officer in the Zeon 603rd Technical Evaluation Unit , in charge of testing new military technology. Stationed in the Jotunheim, a civilian transport ship that was converted into military use, Oliver must head into battle and experience the One Year War, only this time from the perspective of a weapon tester who struggles to make an impact on an evolving war during changing times. (Source: ANN)