I think Reimu misinterpreted what Anon said as "Let's refresh and have kids!" Reimu, you silly, silly manjuu :-)
Mister told Reimu...!
So this is that "happiness" thing!! Yuu, Mister Treasure, Reimu is so happy to be alive!Huh? It flushed, then panicked and ran inside its house? Honestly, what an interesting child. If we add another little one, things could get fun...