```boneflow
@id decision-flow
@title "Decision Flow"
@version 1.0.0
@flow direction=TB
@theme light
@joint line=orthogonal
@joint intersection=jump
@layout mode=auto
@layout branch-gap=120

(start:開始)
=>
[request:申請受付]
=>
<check:承認？>

[check] ="承認"=>{key:YES} [ok:実行]
[check] ="否認"=>{key:NO} [ng:差戻し]

[ok] => [merge:完了確認]
[ng].LEFT => [request].LEFT
[merge] => ((end:終了))
```