From a junior-high notebook, unearthed and unsealed: an arcane pocket watch for grown-ups.
Kaikoku is a classic × chuuni pocket-watch alarm app — built from a notebook the developer wrote in junior high and rediscovered decades later.
An antique pocket watch hangs from a real-physics chain in your palm. Snap the hunter lid shut and power gathers; open it and the day is unsealed. By night, wind the dial to cast one of twelve zodiac arcana. By day the sun seals your sorcery — six solar arts answer instead. Shut the lid and wind, and six seal-curses act upon the lid itself.
Rites await: cover the sensor to summon a fleeting night; touch a torn page of forbidden curses and the watch examines its keeper by Face ID — the owner unseals the chapter, while a stranger is shown a magic circle bearing an inviting sigil. Spin too far — thirty-six turns, one full day of the arcane world — and the chain sunders, until you resummon the watch by rite.
It keeps real time too: alarms with six bells, a magic hourglass timer, a chronograph with Live Activities, an Apple Watch companion that resonates with your pocket watch, widgets, StandBy, and a wall-pinned grimoire recording your deeds and chants.
On iPhone Duo the watch follows the fold: closed, open or half-folded, the dial and its chambers arrange themselves to suit each pose.
Every spell, art, and bell is free. Ads help keep the watch wound — forge the Pact (lifelong or monthly) to still them for good, or invoke a brief Farsight rite to send them away for a while.
Time is no stream, but an illusion dwelling in the heart. The one true magic is to carve the now.
Privacy Policy: https://kaikoku.cavemen.jp/privacy.html
Terms of Use (EULA): https://kaikoku.cavemen.jp/terms.html
Ratings & Reviews
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• Alarms have been rebuilt: an alarm whose switch is on now always rings at its time. Fixed alarms that failed to ring on time, or rang all at once in the small hours.
• An alarm that looked switched on in the previous version but was never actually set now shows as off. Turn it on again to have it ring; the app tells you once if any are found.
• "Once" alarms are gone. Leave the weekdays unselected and the alarm rings every day.
• iPhone Duo is now supported: closed, open or half-folded, the watch and its icons arrange themselves to suit.
• The familiar can now be sent to sleep and woken again. When asked to silence a bell, it now stops only your alarms — never the timer or the Rite of Waking.
Version 1.2.9
The developer, 株式会社Cavemen.jp, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Location
User Content
Identifiers
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
CAVEMEN JP, K.K.
Size
87.7 MB
Category
Utilities
Compatibility
Requires iOS 26.0 or later.
iPhone Requires iOS 26.0 or later.
iPad Requires iPadOS 26.0 or later.
Mac Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.