Opening a practice story.

[silvergazimon]

Hello, I am trying to write out a sentence for a practice story and I was wondering if I was doing alright.

不可能 旗色 信ずる, でも 男子 ボックス の イテム がっぷり です。

The sentence is suppost to be be, at least a loose adaption, reads:

[it is] impossible to believe [in this] situation, but he is holding the box with the item.

Thanks in advance for your help.

[RadioKid]

it would depend on the context. One example will be,

信じられないような状況だが、彼はその箱をアイテムと 一緒に持っている。

This can be wrong when pre-condition is different.