I remember this manga! I read up to volume 2 before volume 3 and stopped after Alex and Jin.... Anyways, I dropped this because I sensed drama and heartache, and not the good kind for my health. It's an interesting story, but it becomes so frustrating in a realistic toxic relationship kind of way where we are observing it go down even as we give good advice they clearly ignore. After reading the comments, I remembered this manga and am so glad I read them because I would have accidentally picked it up again. Thank you author, but that's enough.
Zutto Kitto