On the condition that you shift your lodgement booking,
I suggest you modify your timeline like this.
Day 1 = Jun-09 (Sat)
: Flying into Narita Airport [NRT].
: Heading to Tokyo; staying overnight.
Day 2 = Jun-10 (Sun)
: Going to Kurobe Unazuki hot spring resort.
: Sightseeing (maybe also into Kurobe Gorge).
: Staying overnight.
Day 3 = Jun-11 (Mon)
: Going to Tateyama Station.
: Sightseeing along the Alpine Route (the 1st half).
: Staying overnight at Murodo.
Day 4= Jun-12 (Tue)
: Sightseeing along the Alpine Route (the 2nd half).
: Going via Nagano Station to Tokyo; staying overnight.
Day 5= Jun-13 (Wed)
: Sightseeing in Tokyo (#).
: Staying overnight in Tokyo.
Day 6= Jun-14 (Thu)
: Day trip to and around Kawaguchiko (#).
: Staying overnight in Tokyo.
Day 7 = Jun-15 (Fri)
: Flying out.
(#) If your flight departure on Day 7 is scheduled in the morning,
it may be better to do Kawaguchiko trip on Day 5 and Tokyo sightseeing on Day 6.
Where exactly in Kurobe will you stay?
Here I assume
your "Kurobe" refers to the area of Unazuki hot spring resort,
which is off the Alpine Route.
cf. Kurobe Dam is along the Alpine Route.
Please know in advance
the transportation modes
along the Alpine Route (Tateyama -- Ogizawa) and its gateways,
especially pay attention to how to have a ride on Tateyama Cable Car.
https://www.japan-guide.com/e/e7551.html?aFROM=2164_7550Day 1: Arrival Narita around 11.15am, then go to Kurobe and stay overnight here. Day 2: Sightseeing Kurobe in morning, then go to Tateyama Alpine and stay overnight at Murodo. On this timeline
: You arrive at Kurobe in the evening;
even if the weather is fine, it can be already dark outdoors.
: Your Kurobe sightseeing has to be done mainly in the morning of Day 2.
: Day 2 is a Sunday; the Alpine Route can be more crowded than on weekdays.
: You may not reach your Murodo hotel by the dinner time.
Day 3 (= Monday, June 11) is a normal weekday.
Day 3: Sightseeing Tateyama Alpine Route, then go to Kawaguchiko and stay overnight here. As is said in my previous response,
you had better visit Kawaguchiko separately from the Alpine Route.
When you try to reach Kawaguchiko in the same day,
you would not have time enough for sightseeing along the Alpine Route;
you spend more than 6 hours
(i.e. at least 1 and a half hour for the 2nd half of the Alpine Route +
at least 4 and a half hours for the leg beyond Ogizawa)
on getting from place to place and waiting for a bus, trains, etc. to depart.