Hi!
I got Kumi’s ending by doing the following:
[Straight forward instructions follows. Read at your own risk!]
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1) No girlfriend when asked
2) Sweep the garden, and take the girls for a tour. To unlock Kumi’s path, go to the mountains.
3) After dinner, pickup the dishes, and when asked by Ayumi to check the bath, tell her to ask Ume-san to do it.
4) [Day 2] Clean up futon.
5) After dinner, go to the employee’s room, and choose to sleep. Play ping-pong with Kumi.
6) [Day 3] Stay in Inn, and clean the Inn. IIRC, you should mop, and the trio will ask you to play with them.
7) You should be able to beat Nanami, and Natsuki (0-5 against you) will make a bet with you. Accept it.
8) When given the choice, let Natsuki break her promise.
This should be enough to unlock Kumi’s path. Hope this helps!
[This message has been edited by fxho (edited 08-23-2001).]