Yakusoku Siren
- Alternative Name:
- 約定之聲, 約束サイレン, The Promise Siren
- Status:
- Ongoing
- Categories:
- Drama, School Life, Shoujo, Slice of Life,
- Type :
- Japanese
- Author:
- Yumeka Sumomo
- Artist:
- -
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A heartbreaking and touching story about two twins: one who hates everything like himself, and a friend who wants to fulfill his oldest promise.