"Hello? Hell... o?" is quite the short RPG-Maker game experience.
You'll start the game as Kazuki in a small one-room house. You're able to interact with various objects in the room, with most of them triggering an ending. There are 30 regular endings, 5 bad endings, 1 good ending and 1 true ending.
Some endings change the next play through. A quite unique idea that sounds good on paper, but was sadly rather poorly executed, because if you're going for the 100% like I did, it will kind of turn out to be a guessing game at some point, because suddenly you need to be in a certain iteration of the house and have to interact with the TV while the phone is ringing. The way to the true ending however was executed in an interesting way of two worlds connecting, and you have to achieve several endings in both mirror worlds to get to the true ending. The game also pulls some meta trolls, where it tells you, that you've "passed on" and can't start a new game... That is, until you restart the whole game...
While the true ending is quite cute and a happy one, some other endings are outright confusing. The worst offender is ending 30 however, which feels completely off. Whenever you check the curtains, there is a one out of six chance to trigger it and will reveal an almost nude Akari (but only from the backside). Why?

The game also quite fails in the graphical and audio aspects. The audio is ok, but most sounds are obviously rather cheap stock sounds that often don't really fit, while the graphics are not really giving me spooky vibes. I'm not really a fan of the RPG Maker VX Ace chibi style. The drawn artworks however are fine, this being some of the ghostly faces that may appear and some pictures during the good and true endings.

The game could have been a lot more. I don't know if it's author Ryuuichi Tachibana ever released other games, either prior or later on, but if they're still active, I hope they improve upon their game's weak points, because the idea is good, just poorly executed.