凯伦

她们的母亲・凯伦(カレン)是英国人。曾经是寄宿在聡里家的女性，但在寄宿期间不知何时与父亲闪电结婚。

摘自本作简介中该角色的段落

Hazuki and Ren's mother and Satori's step mother. She leaves Hazuki and Ren with Satori for an uncertain amount of time while she lives and works in England because she's too busy to care for them alone. She calls her son 'Onii-chan'.

简介来自 VNDB