A 27-year-old Japanese shop-assistant dons a superhero disguise in his spare time in order to help strangers maneuvering the dimly lit stairs of a Tokyo subway station which has no escalators or lifts.

For three months, Tadahiro Kanemasu has used his green suit, with silver trim, to protect his identity as he helps the elderly and people lugging heavy bags or stollers.

"Japanese people find it hard to offer or accept help because they feel indebted to the person," he explained.

He's looking for more volunteers to take shifts helping folks get up and down the lengthy stairway.

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