by what ? uncle ? deceased dad (human dad) ? half-breed ? hasshaku mother ?
my guess is that when she grows the yokai part starts becoming more present in thoughts and actions and after shrinking down she has to gather herself back up mentally. maybe half of her "training" will be keeping herself in check when big after she reveals she isn't that way all the time due to being mixed?That was unexpected, I thought she was a fake Hasshaku from the previous chapter, or a new version of the youkai that popped out after the hentai and stuff started to go around, didn't expect she to be a half youkai, wonder if the author planned or changed things, from her behaviour and abonrmal thought pattern I thought she was lacking normal reactions because she had changed from a spirit to something that would interact normally with people out of nowhere.
Could be a retconn from the author, but I guess that it works and will make their relationship easier.
So she lives with her uncle? What was the deal of renting Seiichiro's friend's room then?
IIRC they're only renting that space for the experiments as a space that is:Wait I thought she lives in the MC's friend apartement?