Ep. 22: Eru and Houtarou investigate a bridge construction disruption during the Hina Doll Festival procession.

Eru requests Houtarou’s assistance as an umbrella carrier for the Hina Doll Festival. Their route is blocked by construction on a small bridge, though a worker permits passage. Upon learning the main bridge is under construction, the staff becomes distressed, but a brown-haired young man suggests an alternative route. Fuyumi Irisu appears as the Emperor, with Eru beside her in full ceremonial garb. Houtarou is distracted by her appearance, wondering if he can see her face again. Later, they deduce the brown-haired man, who enjoys photography, likely caused the delay to capture better angles. Eru reveals her decision to study science to improve crop efficiency, noting limited local potential but a commitment to return. She expresses a desire for Houtarou to witness this side of her as spring arrives amidst cherry blossoms.
Episodes
- Ep. 18 · Houtarou investigates his teacher's survival of lightning strikes and helicopter concerns.
- Ep. 19 · Houtarou solves a fabricated mystery regarding counterfeit currency to prove his theoretical point.
- Ep. 20 · Eru and Houtarou get locked in a shed while visiting Arekusu Shrine for New Year's Eve
- Ep. 21 · Mayaka seeks Eru's help to improve her Valentine's chocolate while Houtarou investigates its disappearance
- Ep. 22 · Eru and Houtarou investigate a bridge construction disruption during the Hina Doll Festival procession.