Fantastic. This was an unexpected read from me, as I'm not into yuri. However, the premise piqued my interest. I was curious to see whether the author went for the full-on fetishization route or approached it in a more introspective, psychological way. I got more than I bargained for! This series is a melancholic, soothing therapy. Keep in mind we're talking about a VERY slow-burn manga here. It's gentle and nurturing, mainly through Kiku's character. Sena's progression toward her feelings (and general outlook on life) is gradual, the author has let it build up organically. On the surface, 21 chapters (+1 bonus chapter at the end) seem insufficientto tackle such a premise. However, every chapter falls into place. There is nothing superfluous, no asymmetry in how the series is structured. Very few manga have achieved that for me - twice so ones that tend to be on the shorter side of things.

The art can be gorgeous at times. The mangaka seems to be heavily into fashion - the outfits throughout the series are diverse and stylish. Attention is paid to food too (especially sweets), weaving an atmosphere that's feminine in its coziness.

'My Sister's Best Friend, My Lover' is grounded, realistic, and emotional. It's mature. It's beautiful.

It's everything you'd want from a touching story - and it fully deserves a 9/10.