In the first half, Gintoki decides that as protagonist, he can't sit and do nothing as a Gintama game is released. He takes matters into his own hands as Odd Jobs looks to produce a superhit. In the second, Shinpachi buys a new pair of glasses that get him rather high spirits...
So Gin-san doesn't have 
to be the protag here.
.لذا لا داعي أن يكون غين-سان البطل هنا
No tiene por qué ser Gin-san.
Então o Gin não precisa
ser o protagonista.