そもそもアルシエル人が地球人と同じ体の仕組みをしていると仮定しての話ですが、β純血種は体の構成要素からして人間と違うので、生理はない可能性があります。生理の際に排出されるものがうまく内部で循環されるようになっているのではと考えます。生理は心身に支障をきたすデメリットがあるので、設計にあたってわざわざそれを再現する必要があるとは思えません。
対して第三世代は多分普通に生理があると思うので、延命剤に加えその心配もせねばならず、旅の苦労がしのばれます。β純血種に生殖機能があるのはクロガネの思惑によるものですが、元々その目的で造られた訳ではないのに、レーヴァテイルが一気に普及したのは生殖機能のおかげもあっただろうことにやはりおぞましさを感じます…。
(Relating with the earthquake in Kumamoto) Since there is a topic about sanitary goods on my TL, maybe it can be considered indiscreet, but I try to look at this theme.
First of all, this is based on an assumption that people in Ar Ciel have the same body structure as ours; Beta Pureblood possibly might not experience menstruation. I suppose materials which are excreted are somehow circulated within their bodies. I don't think scientists tried to recreate menstruation when they design Reyvateils because it can cause problems with woman's mental and body.
On the other hand, I think Third Generation Reyvateils experience menstruation, so they have to worry about that on top of Daiquirity. I can easily imagine how hard it was when they were travelling. It was Kurogane's idea that Beta Pureblood has reproductive function, but I can't help to feel that it is nauseating that reproductive function surely contributed to spread Reyvateils rapidly among people although their original purpose was not that.
