If you don't like romance and harem novels, then this list might help you find good novels.  This list of Japanese novels is generally of the SOL, fantasy, and adventure genres with the theme of family and friendship.  ... more>>

For example, the adventures of a father and his daughter in a fantasy world.  Or it could be SOL's story that warms the heart.  

Apart from avoiding the harem and romance genres, I also try to avoid red genres as much as possible (genres are forbidden or should not be read by children or under 15 years old) such as adult, mature, ecchi, and gore. But it could be that in the story there is some content as subplots even though it is not the focus of the story. I mean, I'm also disturbed or uncomfortable with the existence of the red genres or similar contents, even though sometimes the contents are a little needed for plot story development.

The following are recommendations for Japanese novels without romance and harem but focusing on stories of family and friendship in a fantasy world. I hope that you all enjoy reading these novels! <<less

I haven't read these yet, but they seem interesting... more>>

35 to 65 are BL <<less

Isekais are fun reads when done right, cringey when generic, and horrible when done wrong.... more>>

Sorted from Best to Worst with the ratings being pretty biased.

Honorable Mentions: The Beginning after the End (NOT ON NU) {4.35/5} It's cool, that's all I can really say.

THE LIST NOW HAS A SECOND PART IF YOU DIDN'T KNOW: https://www.novelupdates.com/viewlist/8455/ <<less

Isekai is tr*sh, but so am I.  Who am I to judge? We got Yaoi, Yuri, ecchi, and lots of cringe so we don't discriminate... more>> as long as the story is decent. <<less