Hi! I read this manga quite some time back. A girl starts dating this guy who is secretly a borderline stalker but not exactly a dark series I guess. I remember few instances from the manga:

1. In one of them he stalks her to a party/ mixer/ get-together she had at a kareoke place and happens to meet his ex-girlfriend there. She asks him if he has told his current girlfriend about his stalker like behaviour because that was the reason they both actually broke up. He almost ends up scaring the daylights out of her for this remark though (this is from one of the initial chapters)

2. Another snippet I remember is that they are travelling in a train headed to Kyoto for a class-trip and another guy who likes her suddenly rushes off with her in a middle of a conversation because the main two leads seem to have a fight or an argument (this was the last update I had read)

I appreciate any help. Thank you!!

miniamaru kareshi?

OMG!! Thank you so much!! This is the one! I'll make sure I do not lose it this time around.