Ah, you hear that? That's the sound of my "feels" acting up. I've always had this problem. I become really attached to the characters in a television show/books series/anime series/manga series and then when I finish said series or show, there's this gut wrenching hole left behind. I'll be honest, most manga series don't actually cause this type of withdrawal. As far as I know, less than 10 manga series I have read have left me at a loss when I complete the final volume. (And by loss I don't necessarily mean I disliked the ending, but rather that I felt sad that I wouldn't be meeting the characters again in new adventures). Meteor Methuselah, or known as Immortal Rain in the U.S., joins the ranks of manga such as Fruits Basket and MeruPuri as one of the few manga that has caused me to grow overly attached to its characters.
Now for a quick summary from mangafox.me (because I'm lazy):
Rain Jewlitt, known as the Methuselah, is a spaced-out, immortal, 624-year-old man dressed in priest's clothes. He's got eternal youth and a large price on his head ... put there by those questing after the secret of his immortality.
Machika Balfaltin is a tomboyish, energetic 14-year-old girl who, upon the death of her grandfather, sets out to kill Methuselah, the one bounty her assassin grandfather, Zol the Grim Reaper, couldn't kill. Instead, however, Machika ends up being saved by Rain again and again from other aspiring bounty hunters attacking them both.
Sound like the beginnings of an odd relationship? You won't believe where their journey takes them ...