Well, you cannot blame Michiko, alothoug she is from all gal's school all the way but that does not mean that they cannot be straight.
When they are maturing into teenagers, they tend to develop crushes and puppy love...but since they have no guys to turn their attention to, they turn their attention to gals...
But asthey mature, they will outgrow this stage...then as they think back, its a silly but funny memory..rite Michiko?