It does indeed said 15th chapter was the finished. But the story isnt close to resolve. And for some reason, the continuation can only be found on Pixiv under the name "辰巳ヶ原さんの愛からは逃げられない【脱出編】" (translate as There's no escaping Tatsumigahara's love [Escape Chapter])
You can copy the Japanese...
Bro I was just catching up on the previous chapter that I didnt read for a month. And as soon as I finished that, you upload this?! What a godly timing. Thank you! that was perfect.
The Author sure made a blunder about fridge. Sure, putting in new stuff that is not cold will eat more electricity. But if the stuff is already at fridge temperature, removing it does nothing. On the contrary, in that state, empty the fridge make you lose more electricity every time you open it...
I think you missed or probably forgot the major turning point of the whole story that MC use skill to redo everything. This includes every world, not just the first one.
i think chap 15 is just the end of this arc. There will be a new arc with plot continuing from this one. So those mystery will still continue being mystery at the end of chap 15. Not sure how many chapters for the next arc tho.