Returning from a full day out, you unlock the door and step inside. Living alone, there's no one to answer when you say "I'm home." You trudge to the bathroom to soothe your tired body, and try to turn on the hot water, but...

The hot water doesn't come on

You search on your phone, but there's no public bath nearby. It was a desperate situation. Then, a thought occurs to you. That's right—you'll ask the neighbor. So you stands in front of Hikaru's room next door and timidly rings the intercom