It is said that Shoichi built the Joten-ji Temple of the Rinzai sect in Tsujinodo (present Hakataekimae 1-chome) and taught a manju recipe to a teahouse owner who was always kind to him when he went around Mt. Aratsu, to the west of Hakata, for takuhatsu (a traditional form of begging, common to Buddhist monks in Japan).
聖一は辻堂（つじのどう現・博多駅前一丁目）に臨済宗・承天寺を創建し、博多の西、荒津山一帯をたく鉢に回っていた際、いつも親切にしてくれていた茶屋の主人に饅頭の作り方を伝授したと。