@So-chan I've read 5 of that manga. And 1 manwha.
In one of them Takada was actually a man whore and picked up Nishimura as a quick ride in her teens when she had glasses and tig of bitties and she killed herself after that. In another Takada had a threesome with current Nishimura and future...
@undulant is correct. My sister is a dentist (cosmetic practice, partnered with a senior orthodontics and cosmetic dentistry consultant and member of the General Dental Council) and you never brush your teeth immediately after eating. Wait at least 20-30 minutes.
@licebmi I actually think this is one of the more insidious problems. On the surface it might seem like a little bit of jealousy but it's how she enacted that jealousy and rationalised doing so which is troubling. "Could the sensitive Saitou-san so easily turn into the person that hurts...
@TNT261 there are multiple facets to this.
1) Jealousy does not give you license to dictate to another who they can or cannot interact with. That's possessive and controlling.
2) She became the abuser. She finds another person in a similar situation to her and instead of empathising with them...
I mean as long as you don't go for some stupid flagship phone or anything made by Apple I can see a phone being able to do that. Not to mention Japan has a bunch of domestically produced phones we don't really get that are lower spec so the power draw on the battery is much lower.