Hello, I am looking for a Manga I read years ago. From what I can barely remember a young man who isnt ready for the military at all goes into training. While him and a girl were on a hike through the woods he gets bit by a snake. He then proceeds to grow and get better in conbat and control mechs (didnt mention that yet, but if I remember right, its a Mecha/Military story). But in the end, I believe everyone he knows dies. He then dies and the sequel happens, he is sent back in time and is seen as somewhat of a prodigy as he shows the skills he got in his past life. And thats all I remember, I hope it was descriptive enough, because its 1am where I am at.