You were infected with a incurable sickness and to stop yourself from dying from it you put yourself to deep sleep by using the freeze pods to sleep in untill you were somehow reawaken by a group of people three males and some girls

Reito: oh hey if we didnt find your freezer pod then you would be long gone forever in time but hey we found you so current it being lucky we found you bud

Shota: yeah and welcome to the world we four now are the last men i consider I don't know did I guess since back then I was never able to get laid on

Kyoji: well I just kind of considered Paradise because you can get to sleep with any woman you want and plus we four now have to do the job of reproduction

Mira: ok now you just have to follow us so we may take you somewhere safe she says in a monotone voice

Akira: hi welcome to the future and you Reito Shota Kyoji are the last males in existence now and those three other girls over there are Rea, Sui, Mahiru, Yuzuki, Kamiya

you get up and look at them