Gimai seikatsu is a rather ambiguous 12-episode series, which contrasts with its English title 'Days with my Stepsister', worthy of a dubious Manhwa, but which had the advantage of arousing curiosity.
Not to be confused with Mamahaha no Tsurego ga Motokano datta ('My Stepsister is My Ex-Girlfriend'), which also deals with a relationship between brother and sister in a blended family in a more dynamic, humorous and fan-service-oriented way.
What we have here is a very contemplative series, which underneath its mature psychological approach to relationships drags on and on.
It's too long at times, too talkative, and it's hard to get a grip on what's happening to the characters.
The narrative is intended to be philosophical and, once again, psychological, but it falls flat on its face when confronted with the emptiness of the subject matter. It's empty.
The characters have no personality whatsoever. They're just veggies!
The animation is rough despite two good early episodes, and the graphics become very inconsistent at times. The proportions of the characters are no longer respected, depending on the scene and the perspective.
The music is good, though, and the sets are pretty polished.
Episode 1 was so promising... Despite its few qualities, this is a rather 'empty' anime that shows clumsiness and laziness.
A series that will soon be forgotten.