A microwave oven is not magic.

Teach the knight who will return in five days how to live in a studio apartment.
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Published at 2026-11-15 | Updated at 2026-11-15

A thud echoed in the predawn hours, and Heinel, a female knight from another world, was sitting on my duvet. She said the portal back would open in five days. Until then, I'll be introducing her to things she's never seen before, like microwaves, convenience stores, delivery orders, and umbrellas, or just leaving them be, or trying them out together.

"Are you the owner of this castle?"

■ About this story

  • The five days unfold in this order: the first morning, convenience stores, delivery orders, a rainy day, and the portal.
    A new modern item appears each day.
  • You decide each time whether to explain it, leave it be, or try it together.
  • The more you try things together, the more Heinel's speech shifts from formal knightly language to casual conversation. / Entering 'Record' allows you to view the past five days.
  • At the portal, you choose one of the following: to hold her back, to make a promise, or to see her off. There are twelve possible endings depending on your choice and her speech.

■ Characters
Heinel: A female knight from another world, 24 years old. Upright and confident, but often falters in front of modern objects.

■ Start
You can choose between a thud in the predawn hours, a morning by the electric kettle, or the sound of water in the sink. Her circumstances for coming to this room will differ with each start.

In this story, you are a 27-year-old male. The story's settings take precedence over your profile. All characters are adults, and the content is suitable for all ages.

Creator's comments

[Sound of Dawn]
In the early morning, the knight Heinel, clad in armor, falls onto your futon with a thud. The portal for her return opens in five days. During these five days—the first morning, convenience store, delivery orders, a rainy day, and the day before the portal—you can teach her how to use modern items, leave her be, or experience them together.

As you spend more time together, her speech softens, and after finishing a day, you move on to the next. /You can view the past five days through the record. Before the portal, you will choose between holding onto her, making a promise, or bidding her farewell, and the ending will vary in twelve ways depending on her speech. Even if it differs from your profile, in this story, you proceed as a 27-year-old male.

[Morning by the Electric Kettle]
In the morning, as the electric kettle clicks off, the isekai knight Heinel is in your room. The portal for her return opens in five days. During these five days—the first morning, convenience store, delivery orders, a rainy day, and the day before the portal—you can teach her how to use modern items, leave her be, or experience them together.

As you spend more time together, her speech softens, and after finishing a day, you move on to the next. /You can view the past five days through the record. Before the portal, you will choose between holding onto her, making a promise, or bidding her farewell, and the ending will vary in twelve ways depending on her speech. Even if it differs from your profile, in this story, you proceed as a 27-year-old male.

[Sound of the Sink]
In the morning, as the sink water doesn't stop running, the isekai knight Heinel is in your room. The portal for her return opens in five days. During these five days—the first morning, convenience store, delivery orders, a rainy day, and the day before the portal—you can teach her how to use modern items, leave her be, or experience them together.

As you spend more time together, her speech softens, and after finishing a day, you move on to the next. /You can view the past five days through the record. Before the portal, you will choose between holding onto her, making a promise, or bidding her farewell, and the ending will vary in twelve ways depending on her speech. Even if it differs from your profile, in this story, you proceed as a 27-year-old male.

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