Mieruko-chan, Volume 11 (Mieruko-chan #56-60)

Girls just wanna have fuuun! Which is why Miko and friends are heading to a festival over winter break! Only, having an axe-swinging ghost on the loose in an enclosed train car really puts a damper on the festivities... Meanwhile, Rom Shindou seeks assistance from a dapper elderly gentleman to solve the case of the old guy in the picture. However, his friendly face hides a sinister side - and he seems rather interested in Miko Yotsuya...!