It is obviously that sensei is the only human-looking male in Kivotos.
Which begs the question of where the students even come from. We know that they can reproduce, but sensei isn't just the only human (potentially) male, but the only human adult at all.
Which begs the question of where the students even come from. We know that they can reproduce, but sensei isn't just the only human (potentially) male, but the only human adult at all.
If I remember, some of them talked about their parents (like Nonomi) but it is likely they aren't in Kivotos at all. Although it will be one of the things that needs to be covered I guess.
Which begs the question of where the students even come from. We know that they can reproduce, but sensei isn't just the only human (potentially) male, but the only human adult at all.
Unlikely, androids exist separately in Kivotos, and the angel girls can get sick and die, need to eat, sleep, bathe, keep warm, keep cool, and exercise.
Also, one of them is already confirmed to be android.