Based on the title provided, this appears to be the Japanese animated series "30-sai no Hoken Taiiku" (translated as "Health and Physical Education for 30-Year-Olds"), often referred to by the short title "30-sai".

: These are the two primary meters. High trust is often required to unlock more personal interactions, while affection generally dictates which ending path you are on. Managing Stress

Ending (no spoilers, but):
The last page doesn't show her walking through the school gate. It shows her opening the door — fully — and standing there in her old uniform, which no longer fits. She's crying. She's smiling. She says, "Will you walk with me?"

Action Variety: Actions range from passive (watching TV together) to active (taking her outside or helping with homework). The Narrative Arc The story is structured around the 30-day countdown:

Below is a short original article/narrative piece written in English, based on that premise.

30 Days With My School-Refusing Sister

The Conflict: The sister's refusal to attend school often stems from social anxiety, bullying, or a general disillusionment with the rigid Japanese education system.

It wasn’t laziness. It wasn’t rebellion. It was fear. She had been bullied in the hallways — not physically, but the kind of quiet, daily cruelty that grinds you down. A group of girls mocked her clothes, her hair, the way she walked. Then they started spreading rumors. Teachers didn’t see it. Friends drifted away.

Days With My Stepsister: Explores the slow, realistic buildup of a relationship between two socially distant siblings.