As eroge enthusiast, I don't think author played much dating sims.
Don't look down on dating sims!💢 Especially those with affection points rather than just event flags, they're wayyy harder
I understand author wants to introduce a rival but this is pretty cringe.
[Edit] Man, people marking this as "confused" pissed me off.
Assuming this collab is one off:
1) It is not possible to clear a dating sim in one go, much less collect every ending as this comic shown.
2) They were competing how fast they can clear the game, as much route as possible. I never seen people compete with dating sims, usually they are making commentary while playing. This is illogical to the game format itself.
3) With points based dating sim, it is normal that the first play is a fail/normal ending or just to build stat for next round, there is no way to pinpoint ending like this comic shown.
3) Halfway through, the gameplay shifted from dating sim, to zombies to tower defense, which is wtf indeed.
3)They actually co-op in the game?! Fighting zombie girls?! How? The whole point of dating sim is it focused on the mc.
4) Their avatar met in the game? This goes beyond vtuber concept itself. The avatar usually on the corner of the game, not in the game itself. They can build similar character in game but not bring their avatar itself. Again, they were playing dating sim, this is not possible. The mc is usually a faceless, pov character.
It breaks the concept of the dating sim genre, heck, vtuber streaming itself. Which in turns makes for a chaotic, confusing and unfunny chapter.