That's...really funny. This manga literally bashed by readers. Somebody couldn't handle the fact that a grown man turning a little girl as his friends child after his death. Yeah yeah i know. It leaves a sour taste in the mouth. But you CAN'T give a 4 or 5 because of this. That's just the plot story and it's not even that bad. For the God's sake, this website gave a 9 to a story about titans eating humans and made it's manga the most popular in the world. In this manga: -We see balanced power levels, unlike other isekai/reincarnation manga's. -Characters has common sense. -There is no ecchi.-MC is OP, but isn't a Mary Sue. (Again, unlike other isekai's)
-Maybe it's not aiming for the top storywise but we still can't guess what will be happen in the next arc.

So this s*it deserves 7 at least. In my opinion it should have been 7,25-7,45. It's your classic half-enjoyable time killer manga. You can try if you don't have anything to read.