Board Thread:Shadow Fight 3 Discussion/@comment-37875052-20190215173506/@comment-31479589-20190217144729

Err, the way I see it is: Shadow got curious that the grave of his waifu has becoming a time portal, and he entered it. Maybe he was expecting something less, before he realised that whatever he found out could actually resurrect May.

That whatever is still a mystery, although I'm hoping they didn't pull out the "Infinite Tsukuyomi" plot here.