Key for normal chapters:

Normal font for out loud speech, actions, narrations, etc.

Italicized writing indicates Natsumi's thoughts.

"Italicized writing in quotation marks indicates someone else's thoughts."

Italicized words for tonal change/sarcasm/exaggeration/etc.

Key for flashbacks:

Italicized writing for out loud speech, actions, narrations, etc.

Normal font for Natsumi's thoughts.

"Normal font in quotation marks for someone else's thoughts."

Normal words for tonal change/sarcasm/exaggeration/etc in a conversation.