A real example of an 80% reduction in shift collection work at a venue with 30 cast members, where the process used to take 6-10 hours per week. We walk through the 3-step migration from scattered LINE messages to cast-app submission and automatic tallying, plus peak-season operations and automatic delivery of confirmed-shift notifications.

Weekly shift collection is a major operational burden at almost every hostess club.

At an average venue (30 cast members), the weekly cycle of collecting, confirming, and announcing shifts takes 6-10 hours. In peak season it takes even longer.

This article explains how to move hostess club shift management from LINE to a cast app, and what the results looked like at a real venue.

The Current Shift Collection Process

A typical weekly shift collection flow looks like this:

Monday: The manager posts "send me next week's shifts" in the LINE group
Tuesday-Thursday: Cast reply in individual LINE messages
- Not everyone replies (follow-up reminders are needed)
- Formats vary: some send only days, some send time slots, some send constraints
Friday: The manager manually re-types the replies into Excel
- Tallying 30 people takes 2-3 hours
Saturday: Optimizing the combinations (adjustment)
Sunday: Announcing the confirmed shifts in the LINE group plus individual messages

Total work: 6-10 hours per week

The Problems

1. Reminders take a lot of work

Not everyone replies by the deadline. 10-15 people need follow-up reminders, and the cycle of checking read receipts and re-sending on LINE repeats over and over.

2. Inconsistent formats

"Mon/Wed/Fri from 8pm" vs. "from 5pm for 4 hours" vs. "same as usual" — free-form text leads to transcription mistakes.

3. Slow response to changes

When a same-day absence comes in over LINE, working out who covers the slot happens verbally. The shift table never keeps up.

4. No history

When you want to analyze shift trends over the past 3 months, scrolling back through LINE to collect the data is unrealistic.

How App-Based Shift Submission Works

The tasteck cast app (a PWA used by cast members) has a shift submission feature that automates the flow:

On the cast side

Open the app (1 tap)
Tap working days on the calendar and select time slots
Multiple days can be submitted in one batch (recently released)
Add constraints in a memo (for example, "late start on school days")
Send — the venue is notified in real time

Time required: 30 seconds to 2 minutes per cast member

On the venue side

Submissions are tallied automatically on the management screen
Calendar view shows who works when, by time slot
One-click bulk reminders to cast who have not submitted
If adjustment is needed, edit the shift and the cast member is notified automatically
Confirm — everyone is notified, and cast can view their confirmed shifts in the app

Work: 1-2 hours per week

Implementation Example

Venue profile:

A hostess club in Ginza
35 cast members, 1 manager + 2 assistant managers
Before: LINE + Excel

Weekly workload before

Task	Who	Time
Initial LINE post	Manager	5 min
Sending reminders (15 people × 2 rounds)	Manager	1 hour
Excel transcription (35 people)	Assistant manager	2.5 hours
Adjustment and confirmation	Manager + assistant manager	2 hours
Confirmation notices (individual LINE)	Assistant manager	1 hour
Total	-	6.5 hours

Weekly workload after

Task	Who	Time
Submission reminders in the app (automatic)	System	0 min
Checking non-submitters + individual DMs (3 people)	Manager	15 min
Adjustment and confirmation	Manager	45 min
Confirmation notices (automatic delivery)	System	0 min
Total	-	1 hour

The reduction

5.5 hours saved per week
Roughly 286 hours per year (about 36 working days) freed up for other work
At an hourly rate of ¥2,500, that is about ¥715,000 per year in labor value

How to Migrate

Stage 1: Pilot (2-3 weeks)

Roll the app out to 5 cast members first
Run the venue-side shift management screen in parallel
Surface any problems

Stage 2: Switch everyone over (1 week)

Invite all cast to the app
Redefine the LINE group as "urgent contact only"
Accept LINE submissions for one more week (transition period)

Stage 3: Optimize operations (ongoing)

Tune the timing of automatic reminders for non-submitters
Optimize the shift submission deadline
Use historical data for demand forecasting

Cast Acceptance

Cast survey (3 months after rollout):

Convenience: 87% said it became "convenient" or "easier"
Burden: 78% said it is "easier than LINE"
Complaints: 10% said "too many notifications" (adjustable in settings)

Because cast also benefit — they can see their own shift history and estimate their pay — the transition tends to happen without resistance.

Summary

Collecting shifts over LINE takes 6-10 hours per week
Via the cast app this can be shortened to about 1 hour per week
Around 286 hours per year in labor savings
87% cast acceptance in the surveyed venue

→ tasteck for hostess clubs

Hostess Club Shift Management: Graduating from LINE — A Real Example of Cutting 6-10 Hours of Weekly Collection Work by 80%