2005年，本作漫画四名女主角初登场时均是高中一年级学生，原本随着漫画的连载开展，现实时间的流逝，作中四名女主角的年龄也会随着增长，但到了2007年，随着动画的开播，作中女主角们在高中三年级二学期的时候，作中时间出现了实质的停滞，直到动画完结之后，作中时间才又恢复流逝，之后，在单行本第6卷，女主角们高中顺利毕业，单行本第七卷，女主角们正式成为大学生。

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