The tailor shop in Ikebukuro: Saika's love and envy

Haruna was a beautiful young lady, she had owned a tailor shop down in the west gate. She had an unfaithful lover or so she says. She has a pair of scissors that resembles a sword/knife, named saika. her unfaithful lover never comes home, she's fine with that because she loves him, but when she finds the person with other women, she grew with envy but saika 'loved' them for her.