Nanatsu-iro★Drops

Episode 2

This episode starts with Masaharu waking up from Sumomo's bed, this also reveals how the moon affects Masaharu's doll form. following this, they captured a second stardrop but are accidentally seen by Sumomo's friend Nadeshiko, which forces them to have to potentially erase her memories. But, thankfully, in the end, Masaharu finds out about a spell that allows Nadeshiko to retain her memories with the caveat (or a warning/caution) that this allowance can only be made once. And it only works if the caster and the person being cast upon, only truly trust each other. They do, of course, and everything works out perfectly fine.