# Hei He
*Also known as: Undetectable Box / 黑盒*

## Facts
- Format: ONA
- Status: concluded
- Year: 2019

## Renewal Score
**Hei He** has a **47% renewal probability** on Courcast (confidence: 91%) as of 2026-07-28.

## Synopsis
I often fall into the fantasy upon her back. What kind of person is she? What does she like? What world view does she hold? From the occasional detailed observations of her daily life, I have inferred many unexplainable clues... After a series of fantastic imagination, I suddenly realized that the girl who has been dialoging with me in my mind is just my own wishful thinking. Therefore, on the day of the reunion, I decided to take this step...

## About Courcast
Courcast forecasts anime renewal probability using daily signals from streaming platforms, fan communities, and industry sources. Each CourScore (0-100) reflects fandom momentum, streaming performance, source material runway, and franchise history.

- Full details: https://courcast.com/title/hei-he-2019
- API: https://courcast.com/api/public/titles/hei-he-2019
- About Courcast: https://courcast.com/about

*Last updated: 2026-07-28*