Stop!! Hibari-kun! S01 E19 Mafia Boy Needs a Bride!

Kōsaku has a dream of being married to Ibari and having children. Don Corleone, a Mafia Don and old friend of Ibari's, visits the Ōzora house. Ibari forces his daughters to wear traditional kimonos then has a heart attack when Hibari also wears one.