Be warned, it has many (as of the current story) unintroduced characters. However, for those that are interested, it does very minorly spoil the direction that the story is taking next. Also, we get to find out the ages of the characters now.
Eliza – 6 and a half (Another spoiler: it seems like she will be 12 at the time of the school arc)
Claudia – 16 (She’s not 10 as I originally thought, I mistranslated it in her introduction chapter, she was actually saying that she’s 10 years older)
Kamil – Roughly 12-15
Earl Terejia – 73
Gunther – 26
Elise – 9
Ratoka – 8