And we're all caught up now.
It should be noted that the girl on the last page, Clarice (presumably referring to herself in the third person) is probably not related to Eva, despite calling her Onee-sama. Richard calls Eva '末っ子' (Suekko) in Chapter 3, meaning "youngest child", so we can probably assume that she's the youngest out of all her (half-)siblings. So she probably calls Eva that out of respect, my speculation being that she once saved her in the past.
As stated on the page, Volume 1 releases in 2 days and I will be buying and translating it, though unsure when I will have time for it, but I also don't know if it even contains any worthwhile bonus content.