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Near the end of [episode 1 of
Tsukigakirei](http://www.crunchyroll.com/tsukigakirei/episode-1-spring-and-
hard-times-734075), beginning around @21:45, we see Akane and her sister in
their room. Akane gets a text from Azumi as her sister is doing something with
her own smartphone. Her sister gets up, sees the text and teases Akane, asking
if that is her boyfriend. This slightly embarrasses Akane. When her sister
leaves the room, Akane picks up her sister's smartphone. She says to herself,
"I'm going to mess with her." At that point she presses something multiple
times. The smartphone is on, but it appears no app is active. So what did
Akane do?

BTW, I'm sure there was nothing malicious involved. It was just two sisters
being playful.

I checked the next episode, but there is no clarification. Maybe I'm just
clueless about Japanese smartphone usage. The common communication app they
all use appears to be [LINE](https://en.wikipedia.org/wiki/Line_\(software\)).
It is a real app, very popular in Japan. It combines texting, telephony, and
instant messaging (over the Internet, not telephone lines). We didn't see if
this is what her sister was using before she left, but that would be my best
guess. Yet how would one mess with it without it being open and active?


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tsuki-ga-kirei
"I'm going to mess with her." -- but what did she do?


Her sister's phone appears to be a recent-model iPhone. Pressing the Home
button and the Sleep/Wake button simultaneously is [how you take a
screenshot](https://support.apple.com/en-us/HT200289).

So she now has a bunch of photos of her lock screen taking up space on her
phone. Take that, Akane's sister!


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answer