From Fakku:
As a teen, Monami ran away from home, trying to become an idol. She failed and came back a few years later, widowed and with a child. Leaving her wild years behind, she took over her father’s dojo and settled down, taking care of her son. She’s still beautiful, tall and very well endowed, plus being a judo teacher left her in a great shape. In other words, she’s the target of all the dojo pupils’ lust. Including her son Yuki. But years of loneliness left her plenty horny, so when Yuki climbs into her bed one night seeing some motherly affection, she starts finding it hard to control herself.