http://www.mangago.zone/read-manga/dekoboko_girlish/
http://www.mangago.zone/read-manga/shinmai_shimai_no_futari_gohan/
http://www.mangago.zone/read-manga/maiko_san_chi_no_makanai_san/
Some of my fave slices of life. The last two deal with food and the first one is mostly humorous ヾ(❀╹◡╹)ノ~
i don't know if you're looking for yaoi, but here are some. Also, sorry that some have some romance in them. It's difficult to find one without romance. I would list others, but they have romance as the main thing
http://www.mangago.zone/read-manga/never_understand/
http://www.mangago.zone/read-manga/lookism/
http://www.mangago.zone/read-manga/sneaky_red/
Any manga/manhwa/manhua with bullying and action, like Save Me ans The Devil's Boy?
Though I'm also looking for Slice of Life manga/manhwa/manhua like 자살소년 and 田中くんは今日もけだるげ. Though preferrably, I don't want one with romance