Aizen-in is located along the route from No.3 Konsen-ji to No.4 Dainichi-ji. In addition to 88 sacred temples, there’re actually more temples that is somewhat connected to Kobo-Daishi. Aizen-in is one of them and it is known from its special temple stamp written by wide-brush.
However, I was stuck by this small hall dedicated to Akazawa-Shinanomori with so many straw sandals with really huge one. If you pray here, it is said that any diseases below your waist can be recovered.
Unfortunately the chief priest is out of office, hence there’re only “Hanshi-nokyo” (pre-written one) available. Indeed, it’s very special.