^ of course Rina alone wouldn't be the trigger.
but as far as i can remember, Rena explained her "hauu" attitude was mainly aimed to make her forget about her "current" families issues.
but i guess it isn't only Rina, but might be the current erratic situation with her father, considering how he is slacking off with job and the like.
As for her hauu behaviour, It is quite difficult to really say if she "pretends" or is really like this (of course, she never was like this to begin with). Of course, she is really mature and sharp, but considering how consistant her behaviour is, it becomes part of her personality somehow. (not a complete lie, i assume, rather a shell which imprinted somehow on her true personality, as the benefit and habit are quite present)
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