Get Chisaki out of here. If you aren't going to MAN THE FUCK UP and go harem mode (hardcore mode, even one woman can be too much sometimes) then at least don't be cliche and pick the most boring one. This always happens. Got a host of girls clamoring for the same guy and he picks the normal, mousey one for a 'normal, wholesome life'.
You need someone to keep you engaged in life, to keep you moving, to fly with you.