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I read this manga a while ago in 2021-2022 where this guy w/ black hair n blue eyes moves to Tokyo university (I think?) to see the guy who comforted him when his pet bird passed. The other guy is his senior and is at a first disgusted by him, thinking he's some creepy stalker. long story short they get close after a mountaineering trip that his club goes onto together. He has pink hair and long hair, he also has a facisnation w/ marbles. It's a shounen ai. If anyone can recognise this from my very vague description, please let me know ╮(￣▽￣)╭