I'm beginning this thread a day early because, although we don't yet have a full report, we do know the hardware numbers for the Switch because Famitsu today reports that Switch has now passed 20,000,000 units in Japan.  For this week Switch sold 71,148, which puts it at 20,018,278 lifetime.

Famitsu – Software sales (Top 30)

01./02. [NSW] Miitopia <SLG> (Nintendo) {2021.05.21} (¥4.980) – 34.451 / 107.176 <60-80%> (-53%)
02./00. [PS4] Biomutant <RPG> (THQ Nordic Japan) {2021.05.25} (¥6.900) – 24.596 / NEW <80-100%>
03./03. [NSW] Monster Hunter Rise # <ACT> (Capcom) {2021.03.26} (¥7.990) – 23.932 / 2.225.801 <80-100%> (-9%)
04./04. [NSW] Ring Fit Adventure # <HOB> (Nintendo) {2019.10.18} (¥7.980) – 14.057 / 2.600.834 <80-100%> (-25%)
05./01. [NSW] Rune Factory 5 # <SLG> (Marvelous) {2021.05.20} (¥6.980) – 12.903 / 115.756 <80-100%> (-87%)
06./08. [NSW] Minecraft # <ADV> (Microsoft Game Studios) {2018.06.21} (¥3.600) – 11.635 / 1.971.879 <80-100%> (+12%)
07./05. [PS4] Resident Evil Village # <ADV> (Capcom) {2021.05.08} (¥7.990) – 10.584 / 173.132 <80-100%> (-35%)
08./07. [NSW] Momotaro Dentetsu: Showa, Heisei, Reiwa mo Teiban! <TBL> (Konami) {2020.11.19} (¥6.300) – 10.290 / 2.202.018 <80-100%> (-10%)
09./11. [NSW] Mario Kart 8 Deluxe <RCE> (Nintendo) {2017.04.28} (¥5.980) – 8.665 / 3.852.865 <80-100%> (-7%)
10./09. [NSW] Super Mario 3D World + Bowser’s Fury <ACT> (Nintendo) {2021.02.12} (¥5.980) – 8.587 / 757.936 <80-100%> (-16%)
11./10. [NSW] New Pokemon Snap <ACT> (Pokemon Co.) {2021.04.30} (¥5.980) – 7.698 / 229.443 <60-80%> (-21%)
12./13. [NSW] Super Smash Bros. Ultimate # <FTG> (Nintendo) {2018.12.07} (¥7.200) – 6.643 / 4.291.915 <80-100%> (-1%)
13./14. [NSW] Animal Crossing: New Horizons # <ETC> (Nintendo) {2020.03.20} (¥5.980) – 5.982 / 6.784.128 <80-100%> (-4%)
14./18. [NSW] Clubhouse Games: 51 Worldwide Classics <ETC> (Nintendo) {2020.06.05} (¥3.980) – 4.961 / 715.510 <80-100%> (+2%)
15./16. [NSW] Super Mario Party # <ETC> (Nintendo) {2018.10.05} (¥5.980) – 4.956 / 1.898.273 <80-100%> (+0%)
16./19. [NSW] Splatoon 2 # <ACT> (Nintendo) {2017.07.21} (¥5.980) – 4.193 / 3.872.414 <80-100%> (-4%)
17./22. [PS5] Resident Evil Village # <ADV> (Capcom) {2021.05.08} (¥7.990) – 3.695 / 51.868 <60-80%> (+9%)
18./20. [NSW] Pokemon Sword / Shield # <RPG> (Pokemon Co.) {2019.11.15} (¥5.980) – 3.572 / 4.056.240 <80-100%> (-2%)
19./00. [NSW] World’s End Club <ADV> (Izanagi Games) {2021.05.27} (¥4.980) – 2.968 / NEW <20-40%>
20./21. [NSW] Fitness Boxing 2: Rhythm & Exercise <HOB> (Imagineer) {2020.12.03} (¥5.800) – 2.892 / 104.597 <80-100%> (-15%)
21./00. [NSW] Detective Bokumetsu <ADV> (Nippon Ichi Software) {2021.05.27} (¥6.980) – 2.696 / NEW <40-60%>
22./24. [PS4] Judgment [2][New Price Edition] <ADV> (Sega) {2021.04.23} (¥1.800) – 2.566 / 18.234 <60-80%> (-16%)
23./25. [NSW] Super Mario 3D All-Stars <Super Mario 64 Super Mario Sunshine Super Mario Galaxy> <ACT> (Nintendo) {2020.09.18} (¥6.480) – 2.157 / 593.574 <80-100%> (-25%)
24./23. [PS4] NieR Replicant ver.1.22474487139… <RPG> (Square Enix) {2021.04.22} (¥7.800) – 2.143 / 156.346 <80-100%> (-31%)
25./00. [NSW] Dragon Quest XI S: Echoes of an Elusive Age – Definitive Edition [New Price Edition] <RPG> (Square Enix) {2020.12.04} (¥4.980) – 2.047 / 100.524 <80-100%> (+42%)
26./00. [NSW] Paradigm Paradox # <ADV> (Idea Factory) {2021.05.27} (¥6.500) – 1.983 / NEW <60-80%>
27./27. [NSW] The Legend of Zelda: Breath of the Wild # <ADV> (Nintendo) {2017.03.03} (¥6.980) – 1.907 / 1.820.114 <80-100%> (-5%)
28./06. [NSW] Angelique Luminarise # <ADV> (Koei Tecmo) {2021.05.20} (¥7.800) – 1.662 / 14.506 <80-100%> (-87%)
29./00. [PS5] Demon’s Souls <RPG> (Sony Interactive Entertainment) {2020.11.12} (¥7.900) – 1.607 / 51.796 <80-100%>
30./29. [NSW] Human: Fall Flat <PZL> (Teyon Japan) {2020.06.25} (¥3.500) – 1.603 / 151.508 <80-100%> (+2%)

Number of games in Top 30

NSW – 24
PS4 – 4
PS5 – 2

Famitsu – Hardware

Things to note, NSW is at 2678k with 4 weeks left to end the First half.

2020 NSW did 2667k in the first half, so 4 weeks to increase the gap then bamm summer

The switch is just rolling along like nothing else matters

Seems like scalpers and JAV enthousiasts got theirs hands on PS5s again.

the only explanation.

Top 10 and full hardware info now up in the OP!

Miitopia takes #1 (!!) and Biomutant debuts at #2. Big jump up for the PS5 as well.

Great bounce back PS5 and Switch loses some ground compared to 2020 this week.

Miitopia is actually looking pretty good at this point.  Last week Rune Factory 5 debuted at #1 and Miitopia debuted at #2.  This week Miitopia is at #1 and RF5 fell to fifth place with a huge 87% drop.  Looks like Miitopia is going to outsell it in the long run in spite of RF5's strong debut.

Switch just reached 20m and it's sales are still increasing YoY overall.  Think about that.  Sales are not even slowing down yet.  A system usually peaks around the time it gets to roughly half of its sales.  (I.e. about 1/2 of sales on its way up and about 1/2 coming down.)  Switch still hasn't peaked.  That means 40m is a pretty decent estimate for Switch's lifetime in Japan.  In fact, it might go significantly above 40m, because Switch still hasn't peaked yet.  At this point who knows how far it can go?

We'll let T-bone making a prediction

Well deserved for Miitopia, it's such a good funny game.