I think this story would be more tense if the guy had something to lose. Like if he was already in a relationship or has legitimate concerns it'll end up like obsession with a dead pet as foreshadowing. But like, this doesn't seem that bad at all. Also it is a little weird to not threaten his friend's sister or at least not mention her cuz she is publically making bento for him. I dunno. This just seems flirty and coy rather than stalkery.
right.
Any "stakes" to this are entirely in his head, predicated on his desire to be some background mob who doesn't stand out in any way and can simply live that "romcom manga protagonist peaceful boring life" that they all seem to want (while simultaneously getting upset at others for being normal & popular, for some reason). This is just him literally making a mountain out of a molehill. The
only thing that's potentially scary is the "we'll share graves" bit, and even that, depending on the original Japanese, is basically "we'll be together forever" in that "'til death do us part" wedding vow business. The ominous and frightening atmosphere is 100% because of his interpretation of the messages, which are presented through the visuals depicted in the background behind him when he's reacting to the content of what's sent to him, but on their own, I don't really interpret them as anything outright hostile or malignant.
The nice thing, is we have the Stalker now messaging with proof that they can actively see him in places like the classroom. So there's narrative velocity in that, as the behavior being exhibited
is escalating, albeit in a somewhat tame manner (again, pointing to this not feeling as nefarious, outside his specific POV/interpretation). But hopefully it continues to ramp up and more starts happening to push the tension, because we're still pretty mild on that front. I expect lulls in the plot where things depressurize (as any good horror fan would affirm), and I don't think it needs to go straight to 100 before chapter 5.
But there's a balance to how slow the build-up can be, and if this should be taken seriously, then he either needs to get an outside perspective to counter/augment his own view of the situation, or something needs to actually happen that solidifies if this is a 'oh fuck' scenario or what.
Also, it's just a Me Thing but I wish he wouldn't complain about being pushed into abandoning his 'quiet background mob life' by Hinata and his ilk, only to roll over because "you make it hard to refuse you" when a simple 'no' would literally not even be rude (maybe it would be, it's Japan, but). Maybe that's part of it though, and as he descends into madness over the weirdness of this Stalker situation, his behavior and demeanor shifts and it clues in those around him to something actually being wrong (like if he starts actively avoiding Hinata and turning down the others and stuff).
If the author plays it that way, then I'm all in on that depiction of his character.