@Memnon Doh!
. . . There are too many manga.
@KazumaLee94 Well, as to Rintarou, I think it's been pretty clear from the start that he's not what you'd call mentally healthy. "Codependent" nuthin, he's flat out dependent on her; she's his saviour from depression, the antidote to his otherwise bleak world. He used to be a shut-in who feared everything, now he's
still a shut-in who fears everything but his longing for her is stronger than his fear so he goes out into the world because she's there in it, like Gollum leaving the tunnels under the mountains to seek the ring. And like Gollum, he gets upset when anyone else has a claim on his preciousss. Healthy? No.
Umi's plan is just stupid because she's an idiot; I think that's fair enough. This is probably the first time in her life she's ever tried anything that isn't utterly straightforward, so no surprise if it's not that well conceived. It's weird that she's managing to not tell Rintarou something, though, so that feels like "done for forced drama" all right. We'll see how long she can keep her mouth shut.
Minori . . . yeah, that's all kind of weird when I think about it.