Ah the prequel of Takane-san and Arashi-chan? Here, it is translated on twitter:
'A Story where I Befriend the Beauty who Saved Me from being Molested'
Finally, he appear
The strongest (beside Elrise), perverted, and glasses bastard. The one whose name listed right after the heroines in the credit scene of the game. The one and only, the truest worshipper of Great Saint Elrise
SUPPLE MENT!!
Maybe because I seen this kind of patterns a lot in other works. There is always one character (A) go straight forward to do things that they think is right without considering any other factor or consequence to themself, and one other character (B) that cares for A by doing whatever it takes...
There is definitely a catch for all of this shenanigans. A plot twist. I won't even be surprised if Hidaka turned out to be Yandere for Hinako because if you remember in Ch 1, Hidaka said that she wanted to be with Hinako even if the world ends. And her act of severing her bonds of sisterhood as...
From what I get, their school are doing some kind of hostess club or prostitution. Hidaka as student council president is the proxy for the adult to scout the girls into 'business'. Because of that, Hidaka get Munakata and Shiori involved in the scheme and inflicting some pyschological trauma...
Unless Hidaka has other purpose to rewind time. Like maybe she want to take Hinako, but because Hinako can't really win against them, they escaped and Hidaka not letting them go, using her own death to trigger the Rewind.
My take on that, the ability activation condition is the user must died...