Ep. 1: Junichirou Kagami becomes a substitute teacher after his sister forces him to leave his shut-in lifestyle

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Junichirou Kagami is afflicted by a condition called 'Yearn to do,' which restricts his actions to only those activities that genuinely interest him. This limitation has resulted in him living as a shut-in. His sister, exhausted by his lack of productivity and isolation, takes decisive action to change his situation. She compels him to accept a position as a substitute teacher at his former school. This employment serves as a mandatory step to break his reclusive habits and reintegrate him into society through professional responsibility.