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Case study · E-commerce advertising · Japan

An omnichannel ad program, scaled to a 541% return, profitably.

Studio BÜKI sells customizable children's books to families across Japan. The brand needed its advertising to do two things at once: grow, and stay profitable. We built one engine across Google, Facebook and LINE, and tuned it weekly.

B2C e-commerce · Google, Facebook and LINE, run as one engine

541%
Return on ad spend, at peak
+43%
Average increase in ROAS, month over month
6
Months to a clear performance step-change
3 in 1
Google, Facebook and LINE, run as one engine

Figures are the client's own. Return on ad spend is shown at peak, with the verified month-over-month average.

The client

A premium e-commerce brand that needed advertising to pay its own way.

Studio BÜKI makes customizable children's books, a considered, gift-led purchase. Demand was there, but the marketing effort needed structure and the ad accounts needed to work harder for every yen.

The goal was not just more sales. It was profitable scale, growth that did not give the return back.

At a glance
Sector
B2C e-commerce, custom children's books
Market
Japan
Channels
Google, Facebook, LINE
Goal
Profitable scale
Cadence
Weekly optimization
The challenge

Growth is easy to buy. Profitable growth is not.

Spend can always go up. The hard part is scaling it without watching the return collapse.

01

Profit, not just spend

The advertising had to be genuinely profitable, and it had to save the team time and resources, not consume them.

02

The effort lacked structure

Marketing was happening, but without one coherent strategy holding the channels together and pulling in the same direction.

03

The accounts could work harder

Google, Facebook and LINE were each leaving performance on the table, especially LINE, a channel most brands neglect.

The real issue: spend was not the problem. Structure was. So we built one engine and a weekly rhythm to compound it.

The approach

One engine, three channels, tuned every week.

We built an omnichannel program designed for profitable scale, then compounded it with a disciplined weekly optimization rhythm.

Google

Capture and scale demand

Dynamic Search Ads and exact-match campaigns ran alongside Performance Max to capture intent and scale it profitably.

Facebook

Multi-funnel creative

Multi-funnel targeting with continuous creative optimization, from prospecting new families through to retargeting.

LINE

Audited and rebuilt

The LINE account was audited and restructured to perform in a channel most brands in Japan underuse.

Marketing consulting tied the three channels into one strategy, and a disciplined weekly optimization loop compounded what worked.

The proof

From underperformance to a 541% return.

Spend grew into the six figures without giving the return back. The climb compounded at an average of 43% month over month.

Return on ad spend
higher is better
Before
Peak
541%
Return on ad spend, at peak
+43%
Average increase in ROAS, month over month
6 months
To a clear performance step-change

Only the verified peak return and the month-over-month average are shown. The shape of the climb between is illustrative.

The result

Profitable scale, by design.

An omnichannel build, a rebuilt LINE account, and a disciplined optimization loop let spend grow without giving back the return.

541%
Return on ad spend, reached at peak
+43%
Average increase in ROAS, month over month
6
Months to a clear performance step-change
Metric
Basis
Result
Return on ad spend
At peak
541%
ROAS growth
Month over month
+43% avg
Total ad spend
Scaled
Six figures, profitable
Step-change
From start
Within six months
Channels
Run as one
Google, Facebook, LINE
Why it worked

Profitable scale is a structural outcome.

It was not one clever campaign. It was an omnichannel build, a rebuilt LINE account, and a weekly loop that compounded the winners.

Structure over spend

One strategy held Google, Facebook and LINE together, so the channels reinforced each other instead of competing.

Every channel earning

Even the neglected LINE account was audited and rebuilt to carry its weight in the mix.

A weekly loop that compounds

Disciplined weekly optimization meant the winners scaled and the waste was cut, week after week.

★★★★★
The professional, timely, and data-driven service led us to quickly reach excellent profitability.
Fukumi KazlouCEO, Studio BÜKI
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