Himitsu no Hanazono Apato

From MangaHelpers:

This manga features stories of love involving people living in the Hanazono apartments. The first story follows Ruri, a teenager who lies to her former-yankee protective older brother in order to visit her crush, former-yankee Tsukasa, in his apartment each day. Ruri's feelings are obvious, but does Tsukasa return her feelings? What will happen when her brother finds out where she's been spending her time? The next stories follow other inhabitants of the apartment building and their experiences with love. [tethysdust]