@startuml
actor "User" as u
rectangle "View" as v
rectangle "Presenter" as p
rectangle "Model" as m
database "Data Source" as d

u -> v : ユーザ操作
v -> p : ユーザ操作を通知
p -> m : モデル更新
m -> d
p <<- m : 更新通知
v <- p : 描画
@enduml