It is a spotty/fragmented memory.

Haru is woken up early in the morning. Today is actually a lucky day in a sense because there's an extracurricular class. It's a history museum? Music?? In any case, it's a history study session. Haru had been playing online games late into the night. She's viewing the exhibits in a listless, unenthusiastic manner. But Haru has a little secret. It's that her previous life was Takeda Shingen. However, her memories are patchy and vague. Since she only has emotional memories, they're useless for studying. Now Haru looks at the historical materials of her own previous life.